Male 'n' female (3)
I believe the answer is:
hen
'female' is the definition.
(I've seen this before)
'male n' is the wordplay.
'male' becomes 'he'.
'he'+'n'='HEN'
(Other definitions for hen that I've seen before include "Composed of women" , "Clucking female" , "Laying bird" , "Coop resident" , "This party is for women only" .)