Cultured Liberal taken in by long set of policies (9)

I believe the answer is:

partyline

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

'set of policies' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'cultured liberal taken in by long' is the wordplay.
'cultured' becomes 'arty' (I've seen this in another clue).
'liberal' becomes 'l' (abbreviation).
'taken in by' is an insertion indicator.
'long' becomes 'pine' (to pine for someone is to long for them).
'arty'+'l'='artyl'
'artyl' placed inside 'pine' is 'PARTYLINE'.

Can you help me to learn more?

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.