Crossword Genius

When to be fighting fit (4)


I believe the answer is:


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'fit' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bout that I've seen before include "Contest; illness episode" , "Wrestling contest" , "Attack (of illness)" , "Spell of eg drinking" , "wrestling match" .)

I've seen this clue in The Sunday Times and The Times.
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