Betrayal of cause by Egypt's far right (7)
I believe the answer is:
treason
'betrayal' is the definition.
(I know that betrayal can be written as treason)
'cause by egypt's far right' is the wordplay.
I cannot quite see how this works, but
'cause' could be 'reason' (I've seen this before) and 'reason' is found within the answer.
A single letter 't' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for treason that I've seen before include "Perfidy" , "Betrayal of one's nation" , "Offence against state" , "Disloyalty (to one's country)" , "rebellion" .)