King knocked out by shock? No electricity in this state (6)
I believe the answer is:
outage
'shock? no electricity in this state' is the definition.
The definition suggests a singular noun which matches the answer.
'king knocked out by' is the wordplay.
'king' becomes 'age' (I am not sure about this - if you are sure you should believe this answer much more).
'knocked out' becomes 'out' (synonyms).
'by' means one lot of letters go next to another.
'age' put after 'out' is 'OUTAGE'.
Can you help me to learn more?
(Other definitions for outage that I've seen before include "Temporary suspension of operation" , "time of no power" , "Gap in power supply" , "Emaciated" , "Power cut" .)