A boxing match round (5)

I believe the answer is:

about

'round' is the definition.
(thesaurus)

'a boxing match' is the wordplay.
'boxing match' becomes 'bout' (I've seen this before).
'a'+'bout'='ABOUT'

(Other definitions for about that I've seen before include "Concerning; approximately" , "Concerning or in neighbourhood" , "Engaged in" , "Regarding" , "Close to" .)

I've seen this clue in The Independent and The Times.

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