This writer in Somerset town in a trance? (7)
I believe the answer is:
charmed
'in a trance?' is the definition.
(thesaurus)
'this writer in somerset town' is the wordplay.
'this writer' becomes 'me' (the person who is writing these clues).
'in' is an insertion indicator.
'somerset town' becomes 'chard' (I've seen this before).
'me' inserted inside 'chard' is 'CHARMED'.
(Other definitions for charmed that I've seen before include "Entranced" , "Unusually lucky" , "blessed by fortune" , "Enchanted" .)