Crossword Genius

Saintly gatekeeper's famous rabbit (5)

Ross

I believe the answer is:

peter

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'rabbit' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for peter that I've seen before include "Saint at the Pearly Gates?" , "Boy's name - safe" , "In whist, play" , "emperor" , "and 14 dn Latest actor to play Doctor Who" .)

I've seen this clue in The Sun and The Times.
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