Trout is dished up for holidaymaker (7)
I believe the answer is:
tourist
'holidaymaker' is the definition.
('tourist' can be a synonym of 'holidaymaker')
'trout is dished up' is the wordplay.
'dished up' is an anagram indicator.
'trout'+'is'='troutis'
'troutis' with letters rearranged gives 'TOURIST'.
'for' acts as a link.
(Other definitions for tourist that I've seen before include "Tripper, sightseer" , "Person travelling for pleasure" , "Cheap travel class" , "One travels for pleasure" , "Holiday visitor" .)