Crossword Genius

Agism (anag.) (5)

Ross

I believe the answer is:

sigma

(Other definitions for sigma that I've seen before include "Greek letter used as summation sign" , "local opening in Salonika" , "Greek letter signifying sum in maths" , "Gr. letter; rhymes with mark of disgrace" , "character abroad" .)

I've seen this clue in The Telegraph.
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