Body of adult exciting to many (7)
I believe the answer is:
anatomy
'body' is the definition.
(anatomy is a kind of body)
'adult exciting to many' is the wordplay.
'adult' becomes 'a' (abbreviation).
'exciting' is an anagram indicator.
'to'+'many'='tomany'
'tomany' is an anagram of 'natomy'.
'a'+'natomy'='ANATOMY'
'of' acts as a link.
(Other definitions for anatomy that I've seen before include "Science of bodily structure" , "Study of the structure of animals" , "Branch of biology" , "Bodily structure of animal or plant" , "Scientific study of bodily structure" .)