Stop using keys, getting percentage (12)
I believe the answer is:
decommission
'stop' is the definition.
Both the answer and definition are verbs in their base form.
Maybe you can see a link between them that I can't see?
'using keys getting percentage' is the wordplay.
I cannot quite see how this works, but
'using' could be 'on' (someone using drugs is 'on' them) and 'on' is present in the answer.
'keys' could be 'de' (I've seen this in other clues) and 'de' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for decommission that I've seen is " Take (eg, a warship) out of operation".)