The usual cut on vegetarian food (7)
I believe the answer is:
parsnip
'vegetarian food' is the definition.
'parsnip' can be an answer for 'food' (parsnip is a kind of food). I am not sure about the 'vegetarian' bit.
'the usual cut on' is the wordplay.
'the usual' becomes 'par' (par for the course).
'cut' becomes 'snip' (snipping is a kind of cutting).
'on' says to put letters next to each other.
'par'+'snip'='PARSNIP'
Can you help me to learn more?
(Other definitions for parsnip that I've seen before include "Sweet root vegetable" , "Pale carrot-like vegetable" , "A white root vegetable" , "Pips ran oddly through the vegetable" , "food" .)