Elaborate move — role will diminish (5)
I believe the answer is:
abate
'diminish' is the definition.
(abating is a kind of diminishing)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for abate that I've seen before include "drop off" , "retreat" , "Relax" , "Become less strong like storm" , "Wane" .)