Thrown at tyre of compact (6)
I believe the answer is:
treaty
'compact' is the definition.
(I know that compact can be written as treaty)
'thrown at tyre' is the wordplay.
'thrown' indicates an anagram.
'at'+'tyre'='attyre'
'attyre' with letters rearranged gives 'TREATY'.
'of' is the link.
(Other definitions for treaty that I've seen before include "Compact - agreement" , "Written agreement between two states" , "something of Rome or Versailles?" , "Formal pact" , "Compact; concordat" .)