They polish cushions! (7)

I believe the answer is:

buffers

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

'cushions' is the definition.
('buffer' can be a synonym of 'cushion')

'they polish' is the wordplay.
I cannot quite understand how this works, but
'polish' could be 'buff' (buffing is a kind of polishing) and 'buff' is found within the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

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

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