Maverick or a well-fed ungulate? (6,4)
I believe the answer is:
fallow deer
'ungulate?' is the definition.
(fallow deer is a kind of ungulate)
'maverick or a well-fed' is the wordplay.
'maverick' indicates anagramming the letters.
'or'+'a'+'well'+'fed'='orawellfed'
'orawellfed' is an anagram of 'FALLOW DEER'.
(Other definitions for fallow deer that I've seen before include "Wildlife" , "Antlered beast" , "Antlered animal whose summer coat is reddish with white spots" , "horny beast" .)