It's given open-handedly (4)

I believe the answer is:

slap

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I'm afraid I can't even guess how this answer relates to the clue.

(Other definitions for slap that I've seen before include "Hit with an open hand" , "Sharp smack" , "Strike with the palm" , "Cuff" , "Strike (in the face)" .)

I've seen this clue in the Evening Standard.

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