Struggles to digest tablets (7)

I believe the answer is:

battles

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

'struggles' is the definition.
(I know this)

'digest tablets' is the wordplay.
'tablets' can be anagrammed to 'BATTLES'.
Though, I'm not sure how the anagram is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for battles that I've seen before include "Campaigns" , "Fights, conflicts" , "Military engagements" , "Military set pieces" , "Lengthy conflicts" .)

I've seen this clue in the Evening Standard.

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