Crossword Genius

Writer with cups tipped over soda (6)

Ross

I believe the answer is:

bicarb

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

'writer with cups tipped' is the wordplay.
'writer' becomes 'bic' (kind of pen).
'with' says to put letters next to each other.
'cups' becomes 'bra' (as in the two cups of a bra).
'tipped' says the letters should be written in reverse (letters tipped over).
'bra' reversed gives 'arb'.
'bic'+'arb'='BICARB'

'over' acts as a link.

Can you help me to learn more?

(Other definitions for bicarb that I've seen before include "Antacid" , "Raising agent in baking (colloq.)" , "Salt" , "Digestive remedy (abbr)" , "It helps digestion" .)

I've seen this clue in The Guardian.
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