Rat's head bothered Olivia in food (7)
I believe the answer is:
ravioli
'food' is the definition.
(ravioli is a kind of food)
'rat's head bothered olivia' is the wordplay.
'head' indicates taking the first letters.
'bothered' is an anagram indicator.
The first letter of 'rats' is 'r'.
'olivia' with letters rearranged gives 'avioli'.
'r'+'avioli'='RAVIOLI'
'in' is the link.
(Other definitions for ravioli that I've seen before include "2 [PASTA]" , "Pasta envelopes with savoury filling" , "food parcels" , "Filled type of pasta" , "created with Italian gut in mind" .)