Crossword Genius

Box of transparent mineral (4)

Ross

I believe the answer is:

spar

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

'of transparent mineral' is the wordplay.
'of' indicates a hidden word.
'SPAR' is hidden within 'transparent mineral'.

(Other definitions for spar that I've seen before include "Sticks" , "Box; mineral; pole" , "dispute" , "Length of wood" , "Raps with wooden beam" .)

I've seen this clue in the Sydney Morning Herald.
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