Married wearing collar one's found on a sofa (7)

I believe the answer is:

armrest

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'one's found on a sofa' is the definition.
I can't judge whether this definition defines the answer.

'married wearing collar' is the wordplay.
'married' becomes 'm'.
'wearing' is an insertion indicator.
'collar' becomes 'arrest' (synonyms).
'm' going into 'arrest' is 'ARMREST'.

Can you help me to learn more?

(Other definitions for armrest that I've seen before include "Support for one member" , "Part of a carver chair" , "Padded side to a chair" , "sort of support is needed" , "Part of sofa or chair" .)

I've seen this clue in The Guardian.

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