Crossword Genius

Fight pretence! (4)

Ross

I believe the answer is:

spar

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'fight' is the first definition.
(I know that spar is a more specific form of box)

'pretence' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for spar that I've seen before include "Engage in argument" , "Box (lightly) - fight (verbally)" , "Sticks" , "piece of wood?" , "Box in training - nautical pole" .)

I've seen this clue in the Evening Standard.
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