Crossword Genius

Extreme suffix (3)

Ross

I believe the answer is:

est

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

This is the entire clue.

(Other definitions for est that I've seen before include "Time Americans adopted" , "self-improvement programme" , "psychological programme" , "Suffix showing superlative" .)

I've seen this clue in the Universal.
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