Lovely conclusion? Session hasn't started (9)
I believe the answer is:
endearing
'lovely' is the definition.
(I know that lovely can be written as endearing)
'conclusion? session hasn't started' is the wordplay.
I cannot quite see how this works, but
'conclusion?' could be 'end' (something's conclusion is its end) and 'end' is located in the answer.
The remaining letters 'earing' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for endearing that I've seen before include "Disarming" , "Inspiring affection" , "Charming" , "Engaging" , "delightful" .)