Crossword Genius

Person in clergy beheaded soon (4)

Ross

I believe the answer is:

anon

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'soon' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for anon that I've seen before include "At another time, of old" , "Nameless (abbr.); soon" , "Not identified by name" , "Presently - or unknown" , "Of unknown authorship" .)

I've seen this clue in The Sun.
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