Agree with clubs playing well (7)
I believe the answer is:
conform
'agree' is the definition.
(conforming is a kind of agreeing)
'with clubs playing well' is the wordplay.
'with' is a charade indicator (letters next to each other).
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'playing well' becomes 'on form' (someone on form is performing at a good standard).
'c' put next to 'onform' is 'CONFORM'.
(Other definitions for conform that I've seen before include "Keep to rules or general custom" , "Agree" , "Match" , "Fall into line" , "Comply with accepted rules" .)