Overcome Kyrgios, said to be an unconventional guy (7)
I believe the answer is:
beatnik
'unconventional guy' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'overcome kyrgios said to be an' is the wordplay.
I cannot really see how this works, but
'overcome' could be 'beat' (beating is a kind of overcoming) and 'beat' is found within the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for beatnik that I've seen before include "Social rebel of the 1950s" , "eg Jack Kerouac" , "Kite ban (anag) - 1950s' non-conformist" , "Young person of the '50s and '60s" , "Fifties rebel" .)