City involved industrial action that has no beginning or end (4)
I believe the answer is:
oslo
'city involved industrial action that has no' is the definition.
'Oslo' can be an answer for 'city' (capital of Norway). I am not sure about the rest of the definition.
'beginning or end' is the wordplay.
'beginning' says to take the initial letters.
'end' becomes 'slo' (I can't justify this - if you can you should give a lot more credence to this answer).
The initial letter of 'or' is 'o'.
'o'+'slo'='OSLO'
Can you help me to learn more?
(Other definitions for oslo that I've seen before include "where Ibsen lived under another name" , "Location" , "It's capital in Anglos London" , "Norwegian city, formerly Kristiania" , "Capital city, called Kristiania until 1924" .)