Soldiers move joyfully, bringing in November's supplies (8)
I believe the answer is:
ordnance
'supplies' is the definition.
(I've seen this before)
'soldiers move joyfully bringing in november's' is the wordplay.
'soldiers' becomes 'OR' (Other Ranks).
'move joyfully' becomes 'dance' (dance around in joy).
'bringing in' means one lot of letters goes inside another.
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'dance' placed around 'n' is 'dnance'.
'or'+'dnance'='ORDNANCE'
(Other definitions for ordnance that I've seen before include "type of armament" , "Cannon; munitions" , "Heavy guns and military supplies" , "Arsenal's big guns" , "guns etc." .)