Crossword Genius

Careful and persistent effort (9)

Ross

I believe the answer is:

diligence

'careful and persistent effort' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for diligence that I've seen before include "Old stagecoach" , "Thoroughgoing application" , "that could be due?" , "Industriousness" , "Careful and persistent work or effort" .)

I've seen this clue in The Times.
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