State and country get old food (7)
I believe the answer is:
sausage
'food' is the definition.
(sausage is a kind of food)
'state and country get old' is the wordplay.
'state' becomes 'SA' (South Australia).
'and' means one lot of letters go next to another.
'country' becomes 'us' (U.S. is an example).
'get old' becomes 'age' (to age is to get older).
'sa'+'us'+'age'='SAUSAGE'
(Other definitions for sausage that I've seen before include "Eg, salami or pepperoni" , "Item butcher sells" , "Part of a hot dog" , "Tube-shaped food item" , "Chipolata, for example" .)