Crossword Genius

Unacceptable (3,2)

Ross

I believe the answer is:

not on

'unacceptable' is the definition.
(something 'not on' is unacceptable or frowned upon)

This is all the clue.

(Other definitions for not on that I've seen before include "Unacceptable (colloq.)" , "Definitely inadvisable" , "Informally, cannot be permitted or tolerated" , "Impractical" , "Modern usage for unacceptable" .)

I've seen this clue in The Times, The Telegraph, The Guardian and the USA Today.
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