Rough up the Spanish implement (6)

I believe the answer is:

hammer

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'implement' is the definition.
(hammer is a kind of implement)

I don't understand the remainder of the clue.

(Other definitions for hammer that I've seen before include "AuctioneerOs mallet" , "Beat repeatedly; tool" , "Athletic activity" , "It's applied to a nail" , "Hit the nail on the head with this" .)

I've seen this clue in The Guardian.

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