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Fruit and exercise has to manage (5)

Ross

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'fruit' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

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

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(Other definitions for epoch that I've seen before include "Point in time fixed by some great event" , "Period of time marked by a great event" , "Period of notable events" , "A great age from which dates are reckoned" , "Aeon" .)

I've seen this clue in The Mirror.
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