Divide, separate (4)
I believe the answer is:
part
I believe this clue is a double definition.
'divide' is the first definition.
(I know that divide can be written as part)
'separate' is the second definition.
(both can mean to split or break apart)
(Other definitions for part that I've seen before include "Portion, segment" , "goodbye" , "Constituent - something to play?" , "Sever; portion" , "Divide; role" .)