Campaigner, more coarse, when held up (8)

I believe the answer is:

crusader

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

I don't understand the rest of the clue.

(Other definitions for crusader that I've seen before include "Warrior in a holy war" , "For example, Richard I" , "What Simon de Montfort became" , "religious zealot" , "Campaigner for a cause, like Richard the Lionheart" .)

I've seen this clue in The Times.

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