Crossword Genius

Physical effort (8)

Ross

I believe the answer is:

exertion

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

This is all the clue.

(Other definitions for exertion that I've seen before include "Strenuous activity" , "Physical/mental effort" , "Physical or mental effort" , "Great effort" , "Tire oxen with heavy effort" .)

I've seen this clue in The Sun, the King Feature Syndicate, The Mirror and The Daily Mail.
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