Crossword Genius

Source of fizz in cellar originally acquired by fluke (6)

Ross

I believe the answer is:

bicarb

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'fluke' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

'source of fizz in cellar originally acquired' is the wordplay.
'source of fizz' becomes 'barb' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'originally' says to take the initial letters.
'acquired' means one lot of letters goes inside another (inserted letters are acquired by another word).
The initial letters of 'in cellar' is 'ic'.
'barb' going around 'ic' is 'BICARB'.

'by' is the link.

Can you help me to learn more?

(Other definitions for bicarb that I've seen before include "Digestive remedy (abbr)" , "Chemical" , "Baking soda (abbr)" , "baking aid" , "Raising agent in baking (colloq.)" .)

I've seen this clue in The Independent.
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