It can be quite a blow (4)

I believe the answer is:

wind

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'a blow' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for wind that I've seen before include "Breath; twist" , "Twist or turn (in course)" , "Coil; breeze" , "Mistral, for example, or sirocco" , "Air-current" .)

I've seen this clue in the Evening Standard.

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