Man, that does look sore! (4)
I believe the answer is:
chap
'man' is the definition.
(term for a man)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for chap that I've seen before include "Raw, cracked patch on skin" , "(Of skin) become sore" , "Cracked patch (of skin) - gentleman" , "Split in skin" , "Man; (of skin) turn sore" .)