Anna possibly stealing Colin's heart (4)

I believe the answer is:

coin

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'anna possibly' is the definition.
(anna was a historical Indian coin)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for coin that I've seen before include "Think up" , "Money; devise (a word)" , "Metal piece of money" , "American quarter, for example" , "Invent (a new word)" .)

I've seen this clue in The Independent.

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