Vehicle's part for which you need to pay, very possibly (8)
I believe the answer is:
footwell
'vehicle's part' is the definition.
(where your feet go in a car)
'to pay very possibly' is the wordplay.
'to pay' becomes 'foot' (as in footing the bill).
'very possibly' becomes 'well' ('well' can mean 'very').
'foot'+'well'='FOOTWELL'
'for which you need' is the link.
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