Combined with copper money (3)

I believe the answer is:

cum

'combined with' is the definition.
(I've seen this before)

'copper money' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'money' becomes 'm' (abbreviation in economics**).
'cu'+'m'='CUM'

(Another definition for cum that I've seen is " Combined with".)

I've seen this clue in The Independent.

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