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Religious pioneer, one going against the mainstream (4)

Ross

I believe the answer is:

eddy

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This clue might be a double definition.

'religious pioneer' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'one going against the mainstream' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

Can you help me to learn more?

(Other definitions for eddy that I've seen before include "(Of fluid) circle round" , "Man" , "Whirl (in fluid)" , "Current running against the main stream, causes small whirlpool" , "Spin" .)

I've seen this clue in The Times.
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