Crossword Genius

Requiring great exertion (9)

Ross

I believe the answer is:

strenuous

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">requiring great exertion</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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