Crossword Genius

Box for a piece of the rigging (4)

Ross

I believe the answer is:

spar

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

'box for a piece' is the wordplay.
'box for' becomes 'spa' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a piece' becomes 'r' (abbreviation for Rook).
'spa'+'r'='SPAR'

'of the' acts as a link.

Can you help me to learn more?

(Other definitions for spar that I've seen before include "Box; mineral; pole" , "Pole used in rigging - fight" , "Close friend" , "Wooden pole -- box" , "Box in training - nautical pole" .)

I've seen this clue in The Irish Independent.
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