Insect burrowing into ugly vegetable? (8)
I believe the answer is:
plantain
'vegetable?' is the definition.
(I know that plantain is a type of veggie)
'insect burrowing into ugly' is the wordplay.
'insect' becomes 'ant' (ant is a kind of insect).
'burrowing into' indicates putting letters inside.
'ugly' becomes 'plain' (I've seen this before).
'ant' inserted into 'plain' is 'PLANTAIN'.
(Other definitions for plantain that I've seen before include "Tropical food" , "Sort of banana" , "Pal at inn (anag)" , "Low-growing plant; type of banana" , "Green-skinned banana" .)