The solutions to twelve clues, all of which lack definition, have to be adapted as the title indicates before the resulting word is entered in the grid. These resulting words are of a kind. Chambers does not give 4D.
 

Across

1    Grotesque body-snatcher – deaths dismissed (6)
4    Incompetent crossing street (8)
9    Friars make tiny tins (10)
11    Stately home on outskirts of Osaka (6)
12    Green copper transmuted as a matter of import (7)
14    Staff on board railroad (6)
15    Take rest, turning covers back (5)
16    Charwoman talked about a flower (6)
21    Declare girl’s weight (8)
22    Wastes time with Dutch partners (7)
24    Followed old pretentious fellow, we hear (4)
25    Girl with pound and savings account (4)
27    Monopolise 1440, going topless (7)
28    Worthing? Not first turning – straight ahead (7, two words)
33    Fast progress? (6)
34    To that extent, lounge furniture attracts Romeo (5, two words)
35    Sap affected reins (5)
37    One of the adult Beachboys, apparently, as bedtime fairy (7)
38    Wife in the Valleys (6)
39    Note small room with some mixture (10)
40    River course (8, two words)
41    Watch partnership from here? (5)
 

Down

1    Composer around secluded US bay (13, two words)
2    Mechanic’s container Nicola ordered (6)
3    Love let off in loo (7)
4    Two adjacent symbols from grid changed before 1200H (6)
5    Some sun-decks are wavy (4)
6    Shelters partitions in church (7)
7    In the past, anoint some German electress (5)
8    Debauchery’s permits (8)
10    Prude’s desires unfortunately suffered flight problems (13)
13    Highland attendant’s mount that is good at first (7)
15    Look – it’s horrible (5)
17    Throw gold wheel (6)
18    The purpose of camping? (6)
19    Transfer deal starting in Hanseatic city (8, two words)
20    Angler rarely found in sea area (6)
23    Wild reactionaries ignoring scene of missile attack (8, two hyphens)
26    Draw in thesis (7)
29    One Soviet emblem, said to be cold and sharp item (6)
30    Heraldic tincture conductor topped (6)
31    Bridge partners left in the Big Apple (5)
32    More than one spoke (5)
36    Pleas altered (5)
 
A first prize of £30 for the first correct solution opened on 10 April. 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 2302, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.