What politicians need is a liquid asset! (5)

I believe the answer is:

seats

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'what politicians need' is the definition.
I can't tell whether this defines the answer.

'liquid asset' is the wordplay.
'liquid' is an anagram indicator.
'asset' with letters rearranged gives 'SEATS'.

'is a' acts as a link.

Can you help me to learn more?

(Other definitions for seats that I've seen before include "Parliamentary constituencies" , "Chairs, stools" .)

I've seen this clue in the Evening Standard.

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