Gloomy for one visiting local? (8)
I believe the answer is:
negative
'gloomy' is the definition.
(thesaurus)
'for one visiting local?' is the wordplay.
'for one' becomes 'eg' (both can mean 'for example').
'visiting' is an insertion indicator.
'local?' becomes 'native' ('native' can be similar in meaning to 'local').
'eg' placed within 'native' is 'NEGATIVE'.
(Other definitions for negative that I've seen before include "Film with images reversed" , "Opposite of affirmative" , "Snap out of it? Yes" , "Gloom-ridden" , "A test result" .)