Poles in boxes (5)

I believe the answer is:

spars

This clue is a double definition.

'poles' is the first definition.
(spar is a kind of pole)

'boxes' is the second definition.
(sparring is a kind of boxing)

'in' acts as a link.

(Other definitions for spars that I've seen before include "disputes" , "Boxes" .)

I've seen this clue in The Telegraph.

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