Unclued lights are words from a famous poem whose title will appear in the completed grid and must be shaded. Elsewhere, ignore an accent.
 

Across

4    Fox then dish regulator (11, hyphened)
11    Foals need bananas like certain bats (9, hyphened)
12    Some ignore a great bore (5)
13    Payments to Pope in old coin and notes (7)
14    Nun pig ignored for a long time (3)
15    Tidy number dine on beef (4)
20    Underhand goblin only within Quebec (7)
21    Liqueur I get with round (7)
24    Tinker and MC possibly in conversation (6)
25    Powdered fruit sustains me (6)
29    Cardinal we inducted in the middle (5)
31    Girl digs timeless proverbs (6)
33    Sloppy tinhorns dropping gold pieces (6)
38    Such as should block very sharp weapon (7)
41    Mature cheese (French) from abroad (3)
43    Slimy scrubber Liechtenstein expelled (4)
44    Soldier from Arabia edges away (3)
45    Pink plant spoken about by spooks (7)
46    Great Danes regularly pulled chariots (5)
47    Competitors back from N. Europe including old bishop (9)
48    Wild guy cudgels Republican for trickery (11)
 

Down

1    NCO catches composer in race (6)
2    Half a canticle boosted luminary (5)
3    Involved conflicts distressed gentlest man (11)
6    Embryo foulest criminal left on the shelf (6)
7    Room to manoeuvre as famous general will (6)
8    Unlike Simple Simon, pensioned not so poorly (7)
17    Imperfect flex? (5)
18    Teacher’s gaga – policed when raving (11)
19    Impressions of river got by fishes (5)
22    Zoo Chile restructured contains one protozoan (9)
25    Cheerful Muslim not indeed unknown (5)
27    Columns in Spain tapir mounts (5)
28    Implement gnome spotted (3)
30    In Dominica that fellow Pabulum once swam (7)
34    Perhaps cross Georgia’s up for a drink (6)
35    Aim at high things in afternoon shoot (6)
36    Story about rabbit producing enzyme (6)
39    Imbecile in Australian river (5)
40    Grand poem lifted bovine type (4)
 
A first prize of £30 for the first correct solution opened on 7 August. 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 2319, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.