Sadly my team’s mostly fat and unbalanced (10)
I believe the answer is:
asymmetric
'unbalanced' is the definition.
(I've seen this before)
'sadly my team's mostly fat' is the wordplay.
'sadly' is an anagram indicator.
'mostly' means to remove the last letter.
'fat' becomes 'rich' (as in rich foods).
'rich' with its final letter taken off is 'ric'.
'my'+'teams'='myteams'
'myteams' is an anagram of 'asymmet'.
'asymmet'+'ric'='ASYMMETRIC'
'and' acts as a link.
(Other definitions for asymmetric that I've seen before include "women-only bars" , "Unbalanced" , "kind of bars frequented by gymnasts" , "Irregular" , "crooked" .)