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A tease erasing mark on ballot paper, that doesn't apply (6)

Ross

I believe the answer is:

vienna

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'a tease erasing mark on ballot paper that doesn't apply' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'tease erasing mark on ballot paper that doesn't apply' is the wordplay.
'tease' becomes 'vixen'.
'erasing' indicates named letters should be taken away.
'mark on ballot paper' becomes 'X'.
'that doesn't apply' becomes 'NA' (abbreviation for not applicable).
'vixen' with 'x' taken away is 'vien'.
'vien'+'na'='VIENNA'

Can you help me to learn more?

(Other definitions for vienna that I've seen before include "Austria's capital city" , "Adult home of Beethoven, Brahms, Mozart and Schubert" , "Capital city on the Danube" , "European capital" , "Austrian capital" .)

I've seen this clue in The Guardian.
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