A gender (4)
I believe the answer is:
male
'a gender' is the definition.
(I have seen 'A gender ' mean 'male' so perhaps 'gender' could also mean 'male')
This is the entire clue.
(Other definitions for male that I've seen before include "man?" , "A gender" , "Maldives capital; masculine" , "One cannot have babies" , "Lame sort of fellow" .)