Next time — what about November? (4)
I believe the answer is:
then
'next' is the definition.
(both can mean subsequently)
'time what about november?' is the wordplay.
'time' becomes 't' (abbreviation).
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'about' is a reversal indicator.
'november?' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'eh' reversed gives 'he'.
't'+'he'+'n'='THEN'
(Other definitions for then that I've seen before include "Consequently" , "At that time; next" , "Once upon a time" , "soon?" , "Afterwards - as a result" .)