The last men to raise offspring (4)
I believe the answer is:
rear
This clue is a double definition.
'the last men' is the first definition.
(as in the people at the rear of something)
'to raise offspring' is the second definition.
(Other definitions for rear that I've seen before include "Posterior" , "Buttocks - rise up" , "Bring up (children)" , "Of horse, rise up on hind legs" , "Foster" .)