Crack man (4)
I believe the answer is:
chap
This clue is a double definition.
'crack' is the first definition.
(I know that chap is a more specific form of the action crack)
'man' is the second definition.
(term for a man)
(Other definitions for chap that I've seen before include "Split in skin" , "Cracked skin patch caused by cold" , "Man, sore patch" , "cove" , "we prefer not to have on hand" .)