Crossword Genius

Tireless campaign (7)

Ross

I believe the answer is:

crusade

'tireless campaign' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for crusade that I've seen before include "Religious war" , "Advertising campaign" , "Action by Christians to recapture the Holy Land" , "Drive" , "Medieval Christian military expedition to capture the Holy Land" .)

I've seen this clue in The Wall Street Journal and the L.A. Times Daily.
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