Crossword Genius

Strenuous exertion (6)

Ross

I believe the answer is:

effort

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

This is the entire clue.

(Other definitions for effort that I've seen before include "For eft (anag.)" , "Strain" , "Earnest attempt" , "Attempt, energy exerted" , "Attempt, endeavour" .)

I've seen this clue in The Guardian.
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