Crossword Genius

Watch key? Quite something (3-6)

Ross

I believe the answer is:

eye-opener

'quite something' is the definition.

'watch key?' is the wordplay.
'watch' becomes 'eye' (eye can mean to watch or look at).
'key?' becomes 'opener' (I've seen this before).
'eye'+'opener'='EYE-OPENER'

(Other definitions for eye-opener that I've seen before include "Revelation or enlightenment - with optical reaction?" , "A startling enlightenment!" , "This surprises greatly - makes you look" , "Startling thing" , "Fact that surprises or enlightens in optical way" .)

I've seen this clue in The Telegraph.
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