Fat of the land they say (6)
I believe the answer is:
grease
'fat' is the definition.
(animal fat for cooking)
'land they say' is the wordplay.
'land' becomes 'Greece' (Greece is an example).
'they say' shows a homophone (sound like).
'greece' sounds like 'GREASE'.
'of the' acts as a link.
(Other definitions for grease that I've seen before include "bribe" , "Musical that sounds like a country" , "Fully aware, astonished" , "Lubricate (-ant)" , "Musical animal fat?" .)