Military order concerning spin (5-4)
I believe the answer is:
about turn
'military order' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'concerning spin' is the wordplay.
'concerning' becomes 'about' (about can mean concerning or relating to).
'spin' becomes 'turn' (I've seen this in other clues).
'about'+'turn'='ABOUT-TURN'
Can you help me to learn more?
(Other definitions for about turn that I've seen before include "concerning act" , "Act of pivoting 180 degrees" , "Pivot 180 degress" , "Major change of attitude" , "command from the sergeant major?" .)