Crossword Genius

Box; mineral (4)

Ross

I believe the answer is:

spar

I believe this is a double definition.

'box' is the first definition.
(spar can mean to box)

'mineral' is the second definition.
(I know that spar is a type of mineral)

(Other definitions for spar that I've seen before include "A mineral; nautical pole" , "Mineral; strong pole" , "What boxers do" , "Crystal - box" , "possibly rigged" .)

I've seen this clue in The Times.
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