Bet on others giving support (8)

I believe the answer is:

backrest

'support' is the definition.
(backrest is a kind of support)

'bet on others' is the wordplay.
'bet on' becomes 'back' (I've seen this in another clue).
'others' becomes 'rest' (eg the rest of a group).
'back'+'rest'='BACKREST'

'giving' acts as a link.

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