Mr Bloggs (3)
I believe the answer is:
joe
'mr bloggs' is the definition.
(as in Joe Bloggs, term for an average man)
This is the entire clue.
(Other definitions for joe that I've seen before include "-- Bloggs, ordinary man" , "-- Orton, playwright" , "--- Gargery (Great Expectations)" , "Boy's name" , "Short for Joseph" .)