Trout is prepared for a visitor (7)
I believe the answer is:
tourist
'for a visitor' is the definition.
(eg someone visiting another country)
'trout is prepared' is the wordplay.
'prepared' is an anagram indicator.
'trout'+'is'='troutis'
'troutis' anagrammed gives 'TOURIST'.
(Other definitions for tourist that I've seen before include "One travels for pleasure" , "Holiday visitor" , "Cheap travel class" , "Someone who travels for pleasure" , "someone on holiday" .)