Volunteers domestic watch (4,5)
I believe the answer is:
home guard
'volunteers domestic watch' is the definition.
I can't tell whether this defines the answer.
'domestic watch' is the wordplay.
'domestic' becomes 'home' (similar in meaning).
'watch' becomes 'guard' (guarding is a kind of watching).
'home'+'guard'='HOME GUARD'
Can you help me to learn more?
(Other definitions for home guard that I've seen before include "Dad's Army" , "Last line of defence in World War II" , "security force" , "Volunteer force" , "World War Two defence organisation" .)