Taste dish including hint of avocado (6)
I believe the answer is:
palate
'taste' is the definition.
(palate can mean an ability to distinguish tastes)
'dish including hint of avocado' is the wordplay.
'dish' becomes 'plate' (plate is a kind of dish).
'including' is an insertion indicator.
'hint of' says to take the initial letters (the smallest possible amount of the word).
The initial letter of 'avocado' is 'a'.
'plate' placed around 'a' is 'PALATE'.
(Other definitions for palate that I've seen before include "Liking" , "One may savour" , "A plate (anag.)" , "Roof of the mouth, seat of taste" , "relish" .)