Winding up with an increase in prices (6)

I believe the answer is:

spiral

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'winding' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for spiral that I've seen before include "Sir, pal winds in continuous loops" , "Winding like the thread of a screw" , "Helical shape" , "Whorl" , "Corkscrew shape (6)." .)

I've seen this clue in the Evening Standard.

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