Crossword Genius

Seat: I offered support for member not returned PM (9,5)

Ross

I think it could be either:

Which length description are you looking for?:

9

9,5

islington north

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'seat' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'i offered support for member not returned pm' is the wordplay.
I cannot quite understand how this works, but
'i' is found in the answer.
'support' could be 'sling' (sling is a type of support for member (ie an arm)) and 'sling' is found within the answer.
an anagram of 'not' is 'ton' which is within the answer.
'pm' could be 'north' (I've seen this before) and 'north' is located in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
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