He follows small female (3)
I believe the answer is:
she
'female' is the definition.
('she' refers to a woman)
'he follows small' is the wordplay.
'follows' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'he' put after 's' is 'SHE'.
(Other definitions for she that I've seen before include "lady" , "Rider's novel" , "Female person" , "fiction" , "That woman" .)