Mark has nothing on, nominally (5)

I believe the answer is:

oscar

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'on nominally' is the definition.
I can't judge whether this definition defines the answer.

'mark has nothing' is the wordplay.
'mark' becomes 'scar' (mark left by an injury).
'has' is a charade indicator (letters next to each other).
'nothing' becomes 'O' (O resembles 0).
'scar' put after 'o' is 'OSCAR'.

Can you help me to learn more?

(Other definitions for oscar that I've seen before include "academy's prize" , "Develop again" , "to wit involved in row" , "US film award" , "heard on the radio after November" .)

I've seen this clue in the Evening Standard.

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