Late reply disappointing Oliver? (2,4)
I believe the answer is:
no more
'late' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for no more that I've seen before include "Monroe (anag)" , "Nothing further" , "Never again, that's the end of it" , "That's all - finished" , "Never again, all gone" .)