Staffroom paper undelivered? Letters quickly written (5)
I believe the answer is:
notes
'staffroom paper undelivered?' is the definition.
I can't judge whether this defines the answer.
'letters quickly written' is the wordplay.
I cannot quite understand how this works, but
'letters' could be 'es' (more than one E) and 'es' is located in the answer.
The remaining letters 'not' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for notes that I've seen before include "Memos; observes" , "Pays attention" , "Written comments" , "Takes into account" , "Cash" .)