Crossword Genius

The spare-part boom? (4)

Ross

I believe the answer is:

spar

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'boom?' is the definition.
(boom is a kind of spar)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for spar that I've seen before include "Mineral; box; wing beam" , "Stout pole, nautically" , "Mast - boom - gaff" , "Crystalline mineral" , "Box in training - mineral" .)

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