Device first to be used if computer stops working? (2-3,6)
I believe the answer is:
on-off switch
'device first to be used if computer stops working?' is the definition.
I know nothing about this answer so I can't judge whether this works.
'device first to be used if computer stops working?' is the wordplay.
I cannot quite see how this works, but
'device' could be 'switch' (switch is a kind of device) and 'switch' is located in the answer.
'working?' could be 'on' (e.g. a machine is working or on) and 'on' is found in the answer.
The remaining letters 'off' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?