Fuss about vocab omitting British fruit (7)
I believe the answer is:
avocado
'fruit' is the definition.
(I know that avocado is a type of edible fruit)
'fuss about vocab omitting british' is the wordplay.
'fuss' becomes 'ado' (synonyms).
'about' indicates putting letters inside.
'omitting' is a deletion indicator.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'vocab' with 'b' removed is 'voca'.
'ado' enclosing 'voca' is 'AVOCADO'.
(Other definitions for avocado that I've seen before include "Tropical tree - edible green-skinned fruit" , "Tropical fruit with a yellow creamy flesh" , "Large-stoned pear-shaped fruit" , "A posh tropical pear" , "Fruit with large stone" .)