Throw out unknown dignitary (6)
I believe the answer is:
worthy
'dignitary' is the definition.
(I've seen this before)
'throw out unknown' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'unknown' becomes 'y' (algebra).
'throw' anagrammed gives 'worth'.
'worth'+'y'='WORTHY'
(Other definitions for worthy that I've seen before include "Meriting respect or esteem" , "Deserving, meritorious" , "Admirable -- dignitary" , "Meriting respect or reward" , "Somebody" .)