Pepys said to have caused indigestion! (9)

I believe the answer is:

dyspepsia

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'indigestion' is the definition.
(synonyms)

'pepys said to have caused' is the wordplay.
'pepys said' can be anagrammed to 'DYSPEPSIA'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for dyspepsia that I've seen before include "it could result from rushing courses" , "Stomach problem" , ""It gives me wind problem"" , "digestive problem" , "internal upset" .)

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

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