Normal to cut the end off vegetable (7)
I believe the answer is:
parsnip
'vegetable' is the definition.
(parsnip is a type of vegetable)
'normal to cut the end off' is the wordplay.
'normal' becomes 'par' (as in par for the course).
'to cut' becomes 'snip' (snip is a kind of cut).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'end off' means to remove the last letter.
'par'+'snip'+'t'='parsnipt'
'parsnipt' with its last letter taken off is 'PARSNIP'.
(Other definitions for parsnip that I've seen before include "food" , "Type of root veg" , "Pale carrot-like vegetable" , "Pips ran oddly through the vegetable" , "A white root vegetable" .)