Crossword Genius

Digest can't aid digestive aid (7)

Ross

I believe the answer is:

antacid

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

'digestive aid' is the definition.
(I've seen this in another clue)

'digest can't aid' is the wordplay.
'can't aid' can be anagrammed to 'ANTACID'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for antacid that I've seen before include "Medicine counteracting gastric juices" , "Substance used to treat stomach upsert" , "Stomach drug" , "Indigestion remedy" , "calming agent" .)

I've seen this clue in the Sydney Morning Herald.
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