Cave dwellers (6)
(Other definitions for apemen that I've seen before include "Extinct human ancestors" , "Our predecessors" .)
'cave dwellers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bats that I've seen before include "Take a stab at the night creatures" , "Crazy - mammals" , "Loopy; mammals" , "Hutton and Gilligan" , "Cuckoo" .)