Industrial action over commander's three wheeler (7,6)
I believe the answer is:
general strike
'industrial action' is the definition.
(I know that general strike is a type of strike)
'over commander's three wheeler' is the wordplay.
'over' means one lot of letters go next to another.
'commander' becomes 'general' (I have seen 'Military commander' mean 'general' so perhaps 'commander' could also mean 'general').
'three wheeler' becomes 'strike' (I am not sure about this - if you are sure you should believe this answer much more).
'general'+'strike' is 'GENERAL STRIKE'.
Can you help me to learn more?
(Other definitions for general strike that I've seen before include "nationwide walkout" , "Everything stops for it" , "1926 withdrawal of labour" , "national crisis" , "all-out effort" .)