Crossword Genius

Vigorous campaign (7)

Ross

I believe the answer is:

crusade

'vigorous campaign' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for crusade that I've seen before include "Used car involved in campaign for a cause" , "Medieval Christian military expedition to capture the Holy Land" , "Vigorous campaign" , "Action by Christians to recapture the Holy Land" , "Religious war" .)

I've seen this clue in The Independent and The Guardian.
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