Bloke Colin has upset (8)
I believe the answer is:
nicholas
'bloke' is the definition.
(man's name)
'colin has upset' is the wordplay.
'upset' indicates anagramming the letters.
'colin'+'has'='colinhas'
'colinhas' anagrammed gives 'NICHOLAS'.
(Other definitions for nicholas that I've seen before include "Patron saint of Greece (and Liverpool)" , "Patron saint of children and Russia" , "Saint associated with Christmas figure" , "Man's name; last tsar" , "Novel featuring Dotheboys Hall" .)