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