Docks raised by blade-sharpener (5)

I believe the answer is:

strop

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'sharpener' is the definition.
(I know that strop is a type of sharpener)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for strop that I've seen before include "rage" , "Paddy" , "Bad temper - sharpen (a razor)" , "Outburst" , "Strip of leather on which razor is sharpened" .)

I've seen this clue in The Globe and Mail.

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