Standard bargain in the vegetable line (7)
I believe the answer is:
parsnip
'the vegetable line' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'standard bargain' is the wordplay.
'standard' becomes 'par' (standard of play in golf).
'bargain' becomes 'snip' (slang term for a good deal).
'par'+'snip'='PARSNIP'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for parsnip that I've seen before include "Plant with edible white root" , "Type of root veg" , "Pips ran oddly through the vegetable" , "Yellow root vegetable" , "Pale carrot-like vegetable" .)