Be thought tipsy (7)
I believe the answer is:
bemused
'tipsy' is the definition.
(thesaurus)
'be thought' is the wordplay.
'thought' becomes 'mused' (musing is a kind of thinking**).
'be'+'mused'='BEMUSED'
(Other definitions for bemused that I've seen before include "Puzzled" , "In the course of puzzling" , "Lost for words" , "Deep in thought" , "Confused, bewildered" .)