Hand over power as days unfold (7)
I believe the answer is:
devolve
'hand over power as' is the definition.
I can't tell whether this definition defines the answer.
'days unfold' is the wordplay.
'days' becomes 'd' (abbreviation for days).
'unfold' becomes 'evolve' (I've seen this before).
'd'+'evolve'='DEVOLVE'
Can you help me to learn more?
(Other definitions for devolve that I've seen before include "Pass powers to regional government" , "Transfer (to regions)" , "Transfer power" , "Delegate" .)