Discuss terms at Eton, e.g. Michaelmas's second, possibly? (9)
I believe the answer is:
negotiate
'discuss terms' is the definition.
(I've seen this in another clue)
'at eton e g michaelmas's second possibly?' is the wordplay.
'michaelmas's second' becomes 'i' (2nd letter of 'michaelmas').
'possibly?' indicates an anagram (I've seen 'possibly' mean this).
'at'+'eton'+'e'+'g'+'i'='atetonegi'
'atetonegi' anagrammed gives 'NEGOTIATE'.
(Other definitions for negotiate that I've seen before include "Find a way over (a difficult path)" , "Discuss the terms of an arrangement" , "Deal, bargain" , "Try to reach agreement through discussion" , "I get a note (anag) - bargain" .)