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Turn to an enlarged cash prize (8)

Ross

I believe the answer is:

rollover

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(Other definitions for rollover that I've seen before include "Turn in bed; allow (debt) to continue" , "big lottery prize" , "Deferring of payment" , "Carrying of a payment over to a later date" , "Reinvestment of funds r" .)

I've seen this clue in The Mirror.
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