Christian campaigner talks to cruise assistant (8)

I believe the answer is:

crusader

I'm a little stuck... Click here to teach me more about this clue!

'christian campaigner' is the definition.
'crusader' can be an answer for 'campaigner' (I've seen this before). I am not sure about the 'christian' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for crusader that I've seen before include "What Simon de Montfort became" , "Religious campaigner" , "Vigorous campaigner" , "Richard I, for instance" , "Warrior in a holy war" .)

I've seen this clue in the Sydney Morning Herald.

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