Virile man's time in French south (4)
I believe the answer is:
stud
'virile man's' is the definition.
(I've seen this before)
'time in french south' is the wordplay.
'time' becomes 't' (abbreviation).
'in' indicates putting letters inside.
'french south' becomes 'sud' ('south' in French).
't' put within 'sud' is 'STUD'.
(Other definitions for stud that I've seen before include "Clothes fastener in horse establishment" , "card game" , "Projecting boss" , "Horse-breeding establishment; jewellery item" , "collection of cars" .)