But it may be just a single shot (6)

I believe the answer is:

volley

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'shot' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for volley that I've seen before include "Simultaneous shooting of a number of weapons" , "Lovely (anag.)" , "Tennis, football, shot" , "Salvo (of bullets)" , "Shot played before the ball bounces" .)

I've seen this clue in the Evening Standard.

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