Single price or payment (4,3)

I believe the answer is:

lump sum

(Other definitions for lump sum that I've seen before include "Single payment as opposed to a number of smaller ones" , "Whole payment" , "Complete payment consisting of a single amount" , "Large payment, often in cash" , "Single payment as opposed to many instalments" .)

I've seen this clue in the Sydney Morning Herald.

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