Crossword Genius

Saintly gatekeeper's famous rabbit (5)

Ross

I believe the answer is:

peter

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

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for peter that I've seen before include "One of Jesus' disciples", "Blue -, ship's flag", "Boy's name (maybe blue)", "Leader of the Apostles", "- Grimes (Britten)".)

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