Crossword Genius

Pole of boxwood? (4)

Ross

I believe the answer is:

spar

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This clue might be a double definition.

'pole' is the first definition.
(I know that spar is a type of pole)

'boxwood?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'of' is the link.

Can you help me to learn more?

(Other definitions for spar that I've seen before include "Pole used in rigging - fight" , "Box (lightly) - fight (verbally)" , "Box - girder" , "Practice boxing with wooden beam" , "Engage in argument" .)

I've seen this clue in the Evening Standard.
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