Stomach remedy that could be formic? (7)

I believe the answer is:

antacid

'stomach remedy' is the definition.

I can't explain the rest of the clue.

(Other definitions for antacid that I've seen before include "Stomach-settling medicine" , "calming agent" , "Stomach-soothing medicine" , "Indigestion remedy" , "Stomach drug" .)

I've seen this clue in The Times.

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