Losing power in particular is unpleasant (4)
I believe the answer is:
icky
'unpleasant' is the definition.
(icky can mean disgusting)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for icky that I've seen before include "horrid" , "Rotten - unpleasantly gooey" , "Repulsively sentimental" , "Sickly sweet" , "Very bad" .)