Husband bitten by green parrot (4)
I believe the answer is:
echo
'parrot' is the definition.
(both can mean to imitate or copy)
'husband bitten by green' is the wordplay.
'husband' becomes 'h'.
'bitten by' is an insertion indicator (I've seen this in other clues).
'green' becomes 'eco' (abbreviation for ecological).
'h' put inside 'eco' is 'ECHO'.
(Other definitions for echo that I've seen before include "'Greek nymph, she pined away until only her voice remained (4)'" , "Languishing nymph" , "The distant sound" , "In Roman mythology, the nymph who loved Narcissus" , "ring" .)