Crossword Genius

Fitter needs wherewithal when struggling to remove both weights (9)

Ross

I believe the answer is:

healthier

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'fitter' is the definition.
('healthy' is associated in meaning with 'fit')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for healthier that I've seen before include "More in the pink" , "less prone to disease" , "Fitter" .)

I've seen this clue in The Telegraph.
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