Crossword Genius

Not even possibly right (5)

Ross

I believe the answer is:

never

'not' is the definition.
(thesaurus)

'even possibly right' is the wordplay.
'possibly' indicates an anagram.
'right' becomes 'r' (common abbreviation).
'even' is an anagram of 'neve'.
'neve'+'r'='NEVER'

(Other definitions for never that I've seen before include "' - - Say - - Again': Bond film" , "Strong negative" , "At no time whatever" , "No way" , "Not in a million years!" .)

I've seen this clue in the Evening Standard.
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