Do some grooming again when in the coop (5)
I believe the answer is:
preen
'do some grooming again when in the coop' is the definition.
I can't judge whether this defines the answer.
'again when in the coop' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'when in' means one lot of letters goes inside another.
'the coop' becomes 'pen' (I've seen this before).
're' going into 'pen' is 'PREEN'.
Can you help me to learn more?
(Other definitions for preen that I've seen before include "to give himself a pat on the back" , "Primp" , "Groom with elaborate care" , "(Of a bird) tidy and clean feathers" , "Tidy and clean (plumage)" .)