Crossword Genius

Practice boxing (4)

Ross

I believe the answer is:

'practice boxing' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for spar that I've seen before include "Box; various minerals" , "What boxers do" , "Sticks" , "bar" , "Box for practice" .)

I've seen this clue in the Penny Press, The New York Times, the Evening Standard, the Universal, the USA Today, the Newsday, The Mirror, the LA Times and The Star Tribune.
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