Crossword Genius

Gospel writer is one suitable for swindling (4)

Ross

I believe the answer is:

mark

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

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

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(Other definitions for mark that I've seen before include "Note - evangelist" , "Point; former coin" , "Characteristic" , "Brand - old German currency" , "follower of Jesus" .)

I've seen this clue in The Times.
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