CO's personal vehicle shows refusal to work (7,6)
I believe the answer is:
general strike
'co's personal' is the definition.
The definition suggests a singular noun which matches the answer.
'vehicle shows refusal to work' is the wordplay.
'vehicle shows' becomes 'general' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'refusal to work' becomes 'strike'.
'general'+'strike'='GENERAL STRIKE'
Can you help me to learn more?
(Other definitions for general strike that I've seen before include "Everybody out!" , "When everyone's out" , "Widespread industrial action" , "nationwide walkout" , "1926 withdrawal of labour" .)