Crossword Genius

Delta neighbor

Ross

I believe the answer is:

epsilon

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

This is the entire clue.

(Other definitions for epsilon that I've seen before include "foreign letter" , "Lose pin (anag.)" , "5th letter of the Greek alphabet" , "small number mispronounced, almost completely the wrong way round" , "Greek short E" .)

I've seen this clue in The New York Times.
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