After November, say, one's eaten more crackers (7)
I believe the answer is:
nuttier
'more crackers' is the definition.
('nutty' can be a synonym of 'crackers')
'after november say one's eaten' is the wordplay.
'after' says to put letters next to each other.
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'say' becomes 'utter' (to utter something is to speak or say it).
'one' becomes 'i' (Roman numeral).
'eaten' indicates putting letters inside.
'utter' going around 'i' is 'uttier'.
'n' next to 'uttier' is 'NUTTIER'.
(Other definitions for nuttier that I've seen before include "That's not so sensible" , "Increasingly unbalanced" .)