Wreck a gentleman got trapped in (3)
I believe the answer is:
mar
'wreck' is the definition.
(I've seen this before)
'a gentleman got trapped in' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
'gentleman' could be 'mr' and 'mr' is found within the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for mar that I've seen before include "Blemish" , "Oh dear!" , "Make imperfect" , "Spoil something" , "'Damage, impair (3)'" .)