Authorise second armed conflict around November (8)
I believe the answer is:
sanction
'authorise' is the definition.
(sanctioning is a kind of authorising)
'second armed conflict around november' is the wordplay.
'second' becomes 's' (common abbreviation).
'armed conflict' becomes 'action' (I've seen this before).
'around' means one lot of letters goes inside another.
'november' becomes 'n' (phonetic alphabet: alpha, bravo, charlie etc.).
'action' enclosing 'n' is 'anction'.
's'+'anction'='SANCTION'
(Other definitions for sanction that I've seen before include "Penalty for breaking law" , "Allow; punish" , "Support" , "Threatened penalty; official permission" , "measure taken against offending country?" .)