Crossword Genius

Exceptional clue ... (6)

Ross

I believe the answer is:

signal

I believe this is a double definition.

'exceptional' is the first definition.
(thesaurus)

'clue' is the second definition.
(thesaurus)

(Other definitions for signal that I've seen before include "Gesture giving information or command" , "Nonverbal action or gesture that encodes a message" , "Message in the form of a gesture" , "Important; cue" , "Gesture or object giving information" .)

I've seen this clue in The Telegraph.
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