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 Universal, the Evening Standard, The Mirror, the LA Times, the USA Today, the Newsday, The Star Tribune and The New York Times.
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