Some seats of a sort (5)

I believe the answer is:

sofas

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

'some seats of a sort' is the definition.
I can't tell whether this defines the answer.

'some seats of a sort' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'SOFAS' is hidden within 'seats of a sort'.

Can you help me to learn more?

(Other definitions for sofas that I've seen before include "Couches" , "Furniture" , "Upholstered seats for more than one" , "Lounges" , "Long upholstered seats" .)

I've seen this clue in The Globe and Mail.

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