Crossword Genius

Discussed peak cause of crime (4,7)

Ross

I believe the answer is:

high treason

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'crime' is the definition.
(high treason is a kind of crime)

'discussed peak cause' is the wordplay.
'discussed peak' becomes 'hight' (I can't justify this - if you can you should believe this answer much more).
'cause' becomes 'reason' (I've seen this before).
'hight'+'reason'='HIGH TREASON'

'of' is the link.

Can you help me to learn more?

(Other definitions for high treason that I've seen before include "Capital offence" , "crime against the state?" , "Betrayal of one's country" .)

I've seen this clue in the Sydney Morning Herald.
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