Turned the ignition key with it? (8,2)

I believe the answer is:

switched-on

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'with it?' is the definition.
(I've seen this before)

'turned the ignition key' is the wordplay.
'turned' becomes 'switched' (switching is a kind of turning).
'the ignition key' becomes 'on' (I am not sure about this - if you are sure you should believe this answer much more).
'switched'+'on'='SWITCHED-ON'

Can you help me to learn more?

(Another definition for switched-on that I've seen is " Aware, up to date".)

I've seen this clue in The Telegraph.

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