Smooth, round seats (5-6)

I believe the answer is:

dress-circle

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'smooth round seats' is the definition.
'dress circle' can be an answer for 'seats' (dress circle is a kind of seats). I am not sure about the 'smooth round' bit.

'smooth round seats' is the wordplay.
'smooth round' becomes 'dress' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'seats' becomes 'circle' (circle is a kind of seats).
'dress'+'circle'='DRESS-CIRCLE'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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