Insect bite is raised (4)
I believe the answer is:
gnat
'insect' is the definition.
(I know that gnat is a type of dipteran)
'bite is raised' is the wordplay.
'bite' becomes 'tang' (both can mean a flavour or taste).
'is raised' says the letters should be written in reverse (going up in a down clue).
'tang' in reverse letter order is 'GNAT'.
(Other definitions for gnat that I've seen before include "Stinging insect" , "Something that bites" , "Small biting fly" , "Small biter" , "a little bit of a nuisance" .)