I leave the janitor to throw out enemy of ancient Greeks (6)
I believe the answer is:
trojan
'enemy of ancient greeks' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'i leave the janitor to throw out' is the wordplay.
'leave' indicates named letters should be taken away.
'to throw out' indicates anagramming the letters.
'janitor' with 'i' taken out is 'jantor'.
'jantor' anagrammed gives 'TROJAN'.
Can you help me to learn more?
(Other definitions for trojan that I've seen before include "Paris, for example - harmful computer program" , "Hard-working person - coded material inserted to disrupt a computer program" , "This legendary horse was wooden and hollow" , "Computer threat" , "A citizen of ancient Troy" .)