In decline, one pre-eminent in evil? (7)
I believe the answer is:
sinking
This clue might be a double definition.
'in decline' is the first definition.
(I've seen this before)
'one pre-eminent in evil?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
Can you help me to learn more?
(Other definitions for sinking that I've seen before include "Going down" , "Falling to the bottom" , "Declining" , "failing" , "in decline" .)