Crossword Genius

Sigma preceder (3)

Ross

I believe the answer is:

rho

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

This is all the clue.

(Other definitions for rho that I've seen before include "letter to Athens" , "Greek P" , "Sophocles character" , "Gr. letter written as P" , "Greek letter used as symbol for density" .)

I've seen this clue in the LA Times.
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