Butcher's singular appearance? (5)
I believe the answer is:
looks
'appearance?' is the definition.
(I know this)
'butcher's singular' is the wordplay.
'butcher's' becomes 'look' (I've seen this in other clues).
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'look'+'s'='LOOKS'
(Other definitions for looks that I've seen before include "(Person's) appearance" , "Physical appearance" , "Seems" , "Views" , "Comeliness (if good!)" .)