Crack and redden (4)
I believe the answer is:
chap
'crack and redden' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for chap that I've seen before include "Bloke, fellow" , "Fish" , "we prefer not to have on hand" , "Cracked skin patch caused by cold" , "(Of skin) become sore" .)