Dictator’s summit grounds for betrayal (4,7)
I believe the answer is:
high treason
'betrayal' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'dictator's summit grounds for' is the wordplay.
'dictator's summit' becomes 'hight' (I can't explain this - if you can you should believe this answer much more).
'grounds for' becomes 'reason'.
'hight'+'reason'='HIGH TREASON'
Can you help me to learn more?
(Other definitions for high treason that I've seen before include "Capital offence" , "Betrayal of one's country" , "crime against the state?" .)