State aid organised with Home Office originally (5)
I believe the answer is:
idaho
'state' is the definition.
(US state)
'aid organised with home office originally' is the wordplay.
'organised with' indicates anagramming the letters.
'home' becomes 'H' (abbreviation as used in sports fixtures).
'originally' suggests taking the first letters.
The initial letter of 'office' is 'o'.
'aid' with its letters anagrammed with 'h' can make 'idah'.
'idah'+'o'='IDAHO'
(Other definitions for idaho that I've seen before include "Pertaining to the Bard" , "The Gem State, known for its potatoes" , "somewhere in the US" , "Union member?" , "US state in the Rocky Mountains" .)