Give weapons to group, or a bit of kit for the captain (7)
I believe the answer is:
armband
'a bit of kit for the captain' is the definition.
I can't tell whether this definition defines the answer.
'give weapons to group' is the wordplay.
'give weapons to' becomes 'arm' (I've seen this in another clue).
'group' becomes 'band' (band can mean a group of people).
'arm'+'band'='ARMBAND'
'or' is the link.
Can you help me to learn more?
(Other definitions for armband that I've seen before include "part of the uniform" , "Worn by football captain or mourner" , "Identification worn on sleeve" , "augmentation to uniform" , "It signals captain" .)