Commander to be facing resistance in time of revolution (7)
I believe the answer is:
october
'time of revolution' is the definition.
(as in the 1917 October Revolution in Russia)
'commander to be facing resistance' is the wordplay.
'commander' becomes 'OC' (short for officer commanding).
'facing' is a charade indicator (letters next to each other).
'resistance' becomes 'r' (electronics abbreviation).
'oc'+'to'+'be'+'r'='OCTOBER'
'in' acts as a link.
(Other definitions for october that I've seen before include "Strong ale" , "It was the eighth month to the Romans" , "Eighth month on the Roman calendar, originally" , "Bore cot in autumn" , "could be a revolution" .)