Ring for captain to supply troop with weapons? (7)
I believe the answer is:
armband
'ring for captain' is the definition.
(I've seen this before)
'troop with weapons?' is the wordplay.
'troop' becomes 'band' (I've seen this before).
'with' says to put letters next to each other.
'weapons?' becomes 'arm' (I am not sure about this - if you are sure you should believe this answer much more).
'band' put after 'arm' is 'ARMBAND'.
'to supply' acts as a link.
Can you help me to learn more?
(Other definitions for armband that I've seen before include "Ring for captain" , "support for member" , "form of identification" , "Inflatable aid for those learning to swim" , "ID worn on sleeve" .)