Sides of butcher's meats (5)
I believe the answer is:
teams
'sides' is the definition.
'butcher's meats' is the wordplay.
'butcher's' is an anagram indicator (I've seen this in other clues).
'meats' is an anagram of 'TEAMS'.
'of' is the link.
(Other definitions for teams that I've seen before include "Groups or troupes" , "Sports sides" , "Squads" , "Groups of people working together" , "Lots of players" .)