Eight headwords in Chambers consist of the same word. Unclued lights (including two trios and one doing double duty) give definitions of these headwords. The word will appear in the completed grid and must be shaded.
 

Across

5    End with cloudy sort of wine (7, hyphened)
10    Strappers said to break down (4)
12    Rod pranged caravan in Mexican city (10)
15    Scandinavian chap portrays meadow with tailless leporine rodent (6)
18    Greasy stuff’s turned Nicole Knight off (5)
19    Is Corn State Charlie related to goddess? (5)
21    A romance at sea being filmed (8, two words)
22    Despise duff component post office dispatched (7)
24    Gale almost squeezes oven into study again (7)
25    Tunic is accepted by ordinary Welshman … (5, two words)
26    … tea service he sent back (5)
29    Bird’s home is best abandoned if engulfed by pollutant (7, two words)
33    Kick champion duck killer (7, hyphened)
35    Fibres spread flu in intensive care unit (8)
42    Lass somersaulting over ditch (6)
44    Self-electing chap arrests angry patriot right away (10, hyphened)
46    Feelings of savage nomad where Nantwich lies (7)
47    Scoundrel Colombia expelled composed scores gently (7)
 

Down

1    John aboard special ship (5)
2    Japanese immigrant lives on whale (5)
3    Chilly Spike chewed licorice men rejected (6)
4    German oil company delivers gypsum (5)
5    One exhausting kitchen item? (7)
6    English murderer set up computer (5)
7    Lively lama cherishes African party game (7)
16    Footwear of boss in weird togs (8)
17    Cook raita entrances (5)
20    Dug within place for French chalk (8)
23    Removes folds from posh new DJ, we hear (7)
27    Old bread which is chewed again – very good crusts (5)
28    King’s scholar given award on Thursday (7)
30    Silent criminal has signs up (7)
31    Boot Mark starts to use, kicking leather, unnerving keepers (6)
32    Sequence from quaint rondo (6)
34    Homesteader and Irish author cycling (6)
36    Body parts of rubber North America imported (5)
37    At home family fill up with fluid substance (5, two words)
38    See a rising political party in secret intrigue (5)
39    Sad song from Tories? (5)
 
A first prize of £30 for the first correct solution opened on 22 October. There are two runners-up prizes of £20. (UK solvers can choose to receive the latest edition of the Chambers dictionary instead of cash — ring the word ‘dictionary’.) Entries to: Crossword 2379, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.