Comfortable seat Conservative surprisingly held: it's free (12)

I believe the answer is:

chesterfield

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'comfortable seat' is the definition.
'chesterfield' can be an answer for 'seat' (chesterfield is a kind of seat). I'm not sure about the 'comfortable' bit.

'conservative surprisingly held it's free' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'surprisingly' indicates an anagram (a surprising ordering of the letters).
'held'+'its'+'free'='helditsfree'
'helditsfree' is an anagram of 'hesterfield'.
'c'+'hesterfield'='CHESTERFIELD'

Can you help me to learn more?

(Other definitions for chesterfield that I've seen before include "Part of Derbyshire" , "Twisted-spire town; sofa" , "Well-padded sofa with two arms and a back" , "Derby town?" , "Sofa; overcoat" .)

I've seen this clue in The Telegraph.

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