Not entirely lament breaking appointment to become representative (8)
I believe the answer is:
delegate
'representative' is the definition.
(I know that delegate is a type of representative)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for delegate that I've seen before include "Committee member" , "Consign" , "Groups representative" , "Give power to someone else" , "Give authority" .)