Crossword Genius

"To the max" suffix (3)

Ross

I believe the answer is:

est

'to the max 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 "psychological programme" , "Suffix showing superlative" , "self-improvement programme" , "Time Americans adopted" .)

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