Polish vase encircled by bloomer (7)

I believe the answer is:

burnish

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'polish' is the definition.
(I know that burnish is a kind of polish)

'vase encircled by bloomer' is the wordplay.
'vase' becomes 'urn' (both can mean a container).
'encircled by' means one lot of letters goes inside another.
'bloomer' becomes 'bish' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'urn' inserted within 'bish' is 'BURNISH'.

Can you help me to learn more?

(Other definitions for burnish that I've seen before include "Rub to shiny finish" , "Make shiny by friction" , "Shine by rubbing" , "Polish by rubbing" , "Polish to a high shine" .)

I've seen this clue in The Sun.

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