Pole for nautical use as a mast or yard, eg (4)

I believe the answer is:

spar

(Other definitions for spar that I've seen before include "Pole-shaped part of the rigging" , "Crystalline mineral" , "Box without punching hard" , "What boxers do" , "Box (gently) - fight (verbally)" .)

I've seen this clue in The Times.

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