Somebody is impotent, perhaps (7)
I believe the answer is:
notable
'somebody' is the definition.
(thesaurus)
I don't 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 "Worthy of remark" , "Worthy of record" , "Celebrated" , "celebrity" , "Eminent" .)