In Singapore, I'm searching for a source of fizz (5)

I believe the answer is:

reims

I'm a little stuck... Click here to teach me more about this clue!

'source of fizz' is the definition.
The definition suggests a singular noun which matches the answer.

'in singapore i'm searching' is the wordplay.
'in' says the answer is hidden in the clue.
'REIMS' is hidden within 'singapore im searching'.

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for reims that I've seen before include "city in NE France" , "City, the traditional site for crowning French kings" , "City of northeast France" , "Champagne capital (variant spelling)" .)

I've seen this clue in The Guardian.

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