Blow with a stick considered comic! (4)

I believe the answer is:

slap

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

I cannot understand how the rest of the clue works.

(Other definitions for slap that I've seen before include "A blow among pals" , "Hit with an open hand" , "Make-up (slang)" , "Cuff" , "Mild punishment" .)

I've seen this clue in the Evening Standard.

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