Out fishing, perhaps, there can be quite a blow (5)

I believe the answer is:

smack

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'blow' is the definition.
(I know that smack is a type of blow)

I don't understand the remainder of the clue.

(Other definitions for smack that I've seen before include "Slap the fishing vessel" , "Sharp slap" , "Kiss - fishing vessel - taste - heroin" , "Sharp taste" , "Slap; single-masted boat" .)

I've seen this clue in the Evening Standard.

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