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