Dish for Scotsman: girl returns with one (8)
I believe the answer is:
macaroni
'dish' is the definition.
(type of pasta)
'scotsman girl returns with one' is the wordplay.
'scotsman' becomes 'mac'.
'girl' becomes 'nora' (girl's name).
'returns' shows that the letters should be reversed in order.
'with' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'nora' in reverse letter order is 'aron'.
'mac'+'aron'+'i'='MACARONI'
'for' is the link.
(Other definitions for macaroni that I've seen before include "Hollow pasta" , "Pasta variety, eighteenth century dandy" , "Pasta in long tubes" , "Italian food" , "Cora and Mina go for pasta" .)