Crossword Genius

For which an aspiring politician may want a party ticket (5,4)

Ross

I believe the answer is:

empty seat

I'm a little stuck... Click here to teach me more about this clue!

'for which an aspiring' is the definition.
The definition suggests a singular noun which matches the answer.

'politician may want a party ticket' is the wordplay.
I cannot really understand how this works, but
'politician' could be 'mp' (Member of Parliament) and 'mp' is present in the answer.
'a' is found in the answer.
'party' could be 'set' (I have seen 'exclusive party' mean 'set' so perhaps 'party' could also mean 'set') and 'set' is present in the remaining letters.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Hindu.
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