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They have an interest in conversion schemes (12)

Ross

I believe the answer is:

missionaries

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

This clue could be a double definition.

'they' is the first definition.
Both the definition and answer are plural nouns.
Maybe they are linked in a way I don't understand?

'an interest in conversion schemes' is the second definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

'have' is the link.

Can you help me to learn more?

(Another definition for missionaries that I've seen is " ministers sent abroad".)

I've seen this clue in The Globe and Mail.
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