It's extraordinary to be so incompetent (7)
I believe the answer is:
notable
'it's extraordinary' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for notable that I've seen before include "Outstanding" , "Widely known and esteemed" , "Worthy of record" , "Eminent" , "Big noise" .)