Not one on view (6)

I believe the answer is:

notion

'view' is the definition.
(I know that notion is a type of view)

'not one on' is the wordplay.
'one' becomes 'i' (Roman numeral).
'not'+'i'+'on'='NOTION'

(Other definitions for notion that I've seen before include "clue" , "Vague idea or opinion" , "Concept, belief" , "desire" , "Whimsical idea or small sewing article" .)

I've seen this clue in The Irish Independent, The Telegraph and The Globe and Mail.

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