Throws out gold wheels (7)

I believe the answer is:

castors

'wheels' is the definition.
(castor is a kind of wheel)

'throws out gold' is the wordplay.
'throws' becomes 'casts' (casting is a kind of throwing**).
'out' is an insertion indicator.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'casts' going around 'or' is 'CASTORS'.

(Another definition for castors that I've seen is " Small wheels".)

I've seen this clue in The Telegraph.

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