Vegetable having a well inverted carbohydrate (9)
I believe the answer is:
asparagus
'vegetable' is the definition.
(asparagus is a kind of vegetable)
'a well inverted carbohydrate' is the wordplay.
'well' becomes 'spa' (I've seen this before**).
'inverted' is a reversal indicator.
'carbohydrate' becomes 'sugar' (sugar is a kind of carbohydrate).
'sugar' written backwards gives 'ragus'.
'a'+'spa'+'ragus'='ASPARAGUS'
'having' is the link.
(Other definitions for asparagus that I've seen before include "cat in dramatic situation" , "The Theatre Cat (T. S. Eliot); an edible plant" , "Plant with edible shoots" , "Plant whose young shoots are cooked as expensive vegeable" , "Succulent edible shoots" .)