Crossword Genius

Pi follower (3)

Ross

I believe the answer is:

rho

'pi follower' 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 "Sophocles character" , "Something like 25 [ETA]" , "Greek letter used as symbol for density" , "Greek character" , "Seventeenth letter of the Greek alphabet" .)

I've seen this clue in the King Feature Syndicate, The New York Times, the LA Times and the Universal.
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