Crossword Genius

Called into action: driven over the edge (8)

Ross

I believe the answer is:

deranged

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'driven over the edge' is the definition.
I can't tell whether this definition defines the answer.

'called into action' is the wordplay.
'called' becomes 'rang' (called on the phone).
'into' indicates putting letters inside.
'action' becomes 'deed' (deed is a kind of action).
'rang' placed inside 'deed' is 'DERANGED'.

Can you help me to learn more?

(Other definitions for deranged that I've seen before include "What Ophelia was eventually" , "Upset" , "Made insane" , "bananas" , "Crackpot" .)

I've seen this clue in The Sun.
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