Money in imperialism (4)

I believe the answer is:

rial

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

'in imperialism' is the wordplay.
'in' indicates a hidden word.
'RIAL' is hidden within 'imperialism'.

(Other definitions for rial that I've seen before include "Cash" , "Monetary unit of Iran" , "Unit of money in Iran, like lira" , "Ready" , "foreign money" .)

I've seen this clue in The Everyman puzzle in The Observer.

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