Fatty ordered pie and soda (7)
I believe the answer is:
adipose
'fatty' is the definition.
(synonyms)
'ordered pie and soda' is the wordplay.
'ordered' is an anagram indicator.
'and' is a charade indicator (letters next to each other).
'pie' after 'soda' is 'sodapie'.
'sodapie' is an anagram of 'ADIPOSE'.
(Other definitions for adipose that I've seen before include "Fat-storing (tissue)" , "Of tissue storing fat" , "Of animal, fat, fatty" , "Like a sort of fat" , "Obese" .)