Crossword Genius

Box of ship's timber? (4)

Ross

I believe the answer is:

spar

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This clue might be a double definition.

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

'ship's timber?' is the second definition.
'spar' can be an answer for 'timber?' (thesaurus). I am not sure about the 'ship's' bit.

'of' is the link.

Can you help me to learn more?

(Other definitions for spar that I've seen before include "Fight - something probably rigged?" , "Box; mineral; pole" , "Crystalline mineral" , "Box - girder" , "Pole used in rigging - fight" .)

I've seen this clue in The Globe and Mail.
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