Crossword Genius

Individual on key (3)

Ross

I believe the answer is:

one

'individual' is the definition.
(an individual is one person)

'on key' is the wordplay.
'key' becomes 'e' (musical key).
'on'+'e'='ONE'

(Other definitions for one that I've seen before include "Hour after midnight" , "SECOND PART OF 16" , "Single and undivided" , "Single person or thing" , "doesn't count for much" .)

I've seen this clue in The Globe and Mail.
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