Crossword Genius

Requiring great exertion (9)

Ross

I believe the answer is:

strenuous

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

This is all the clue.

(Other definitions for strenuous that I've seen before include "Hard" , "Physically demanding" , "Vigorous" , "Requiring great effort" , "Taxing" .)

I've seen this clue in The Guardian.
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