That's right. Olivia ordered pasta (7)
I believe the answer is:
ravioli
'pasta' is the definition.
(I know that ravioli is a type of pasta)
'that's right olivia ordered' is the wordplay.
'that's right' becomes 'r' (abbreviation).
'ordered' indicates anagramming the letters.
'olivia' is an anagram of 'avioli'.
'r'+'avioli'='RAVIOLI'
(Other definitions for ravioli that I've seen before include "Filled envelopes of course" , "Pasta with savoury stuffing" , "Italian pillow-shaped pasta" , "you might have at La Scala?" , "Small stuffed pasta" .)