Having success, daring to give up power (5)
I believe the answer is:
lucky
'up power' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?
'having success daring' is the wordplay.
I cannot quite understand how this works, but
'success' could be 'luck' and 'luck' is found within the answer.
A single letter 'y' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to give' acts as a link.
Can you help me to learn more?
(Other definitions for lucky that I've seen before include "Fortunate" , "Auspicious" , "Serendipitous" , "'It is better to be born . . . . . than rich'" , "Game where prizes are picked from a tub" .)