Coerce tune first from military group (3,5)
I believe the answer is:
air force
'military group' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'coerce tune first' is the wordplay.
'coerce' becomes 'force' (synonyms).
'tune' becomes 'air' (air can mean a piece of music).
'first' means one lot of letters go next to another.
'force' after 'air' is 'AIR FORCE'.
'from' is the link.
Can you help me to learn more?
(Other definitions for air force that I've seen before include "one of the services" , "Armed service" , "Simple tune for church service" , "Kind of blue" , "Country's military planes" .)