Drug tea? It excited a feeling of appreciation (9)
I believe the answer is:
gratitude
'a feeling of appreciation' is the definition.
(I've seen this before)
'drug tea? it excited' is the wordplay.
'excited' indicates an anagram.
'drug'+'tea'+'it'='drugteait'
'drugteait' anagrammed gives 'GRATITUDE'.
(Other definitions for gratitude that I've seen before include "Thanks" , "Appreciation of kindness" , "Feeling of appreciation" , "Thankfulness and appreciation" , "A sense of indebtedness and thankfulness" .)