A party given to officer and men in state (8)
I believe the answer is:
colorado
'state' is the definition.
(I know that Colorado is a American state)
'a party given to officer and men' is the wordplay.
'a party given' becomes 'ado' (I can't justify this - if you can you should believe this answer much more).
'to' says to put letters next to each other (I've seen this in other clues).
'officer' becomes 'col' (short for colonel).
'and' is a charade indicator (letters next to each other).
'men' becomes 'OR' (Other Ranks: non-commissioned soldiers).
'col'+'or'='color'
'ado' after 'color' is 'COLORADO'.
'in' is the link.
Can you help me to learn more?
(Other definitions for colorado that I've seen before include "in America?" , "River running through the Grand Canyon in Arizona" , "American state, capital Denver" , "US state has a strangely cool road" , "US state (with a beetle)" .)