Wooden pole in box (4)

I believe the answer is:

spar

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This could be a double definition.

'wooden pole' is the first definition.
'spar' can be an answer for 'pole' (spar is a kind of pole). I'm not sure about the 'wooden' bit.

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

'in' is the link.

Can you help me to learn more?

(Other definitions for spar that I've seen before include "A mineral; nautical pole" , "Pole used to support sails or rigging" , "Box in training - nautical pole" , "quarrel" , "Length of wood" .)

I've seen this clue in The Sun.

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