Transfer of power achieved finally — a slow process? (10)
I believe the answer is:
devolution
'transfer of power' is the definition.
(I've seen this before)
'achieved finally a slow process?' is the wordplay.
I cannot really see how this works, but
'process?' could be 'evolution' (evolution is a kind of process) and 'evolution' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for devolution that I've seen before include "Transfer of power" , "home rule" .)