Officer and politician work in agreement (7)
I believe the answer is:
compact
'agreement' is the definition.
(compact is a kind of agreement)
'officer and politician work' is the wordplay.
'officer' becomes 'co' (Commanding Officer abbreviation).
'and' says to put letters next to each other.
'politician' becomes 'mp'.
'work' becomes 'act' ('act' can be a synonym of 'work'**).
'co'+'mp'+'act'='COMPACT'
'in' acts as a link.
(Other definitions for compact that I've seen before include "Small case for face powder" , "woman's case" , "Dense; treaty" , "What comes initially with CD" , "Dense; agreement" .)