Support team, heading for stadium seats (9)

I believe the answer is:

backsides

'seats' is the definition.
('backside' can be a synonym of 'seat')

'support team heading for stadium' is the wordplay.
'support' becomes 'back' (to back is to support or endorse).
'team' becomes 'side' (both can mean a sports team).
'heading for' says to take the initial letters.
The initial letter of 'stadium' is 's'.
'back'+'side'+'s'='BACKSIDES'

(Another definition for backsides that I've seen is " seats".)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app