Remedy sipped, say, for indigestion (9)
I believe the answer is:
dyspepsia
'for indigestion' is the definition.
(synonyms)
'remedy sipped say' is the wordplay.
'remedy' indicates anagramming the letters (the letters must be fixed or remedied).
'sipped'+'say'='sippedsay'
'sippedsay' with letters rearranged gives 'DYSPEPSIA'.
(Other definitions for dyspepsia that I've seen before include ""It gives me wind problem"" , "Heartburn" , "digestive problem" , "internal upset" , "Stomach upset - spied a spy (anag)" .)