Crossword Genius

3 on a telephone (3)

Ross

I believe the answer is:

def

'3 on a telephone' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for def that I've seen before include "Brilliant" , "explanation" , "Quick and skilful." .)

I've seen this clue in the Newsday.
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