Provide with a piece from Carmen (3)
I believe the answer is:
arm
'provide' is the definition.
(arming is a kind of providing)
'piece from carmen' is the wordplay.
'piece from' indicates the answer is hidden within the clue.
'ARM' is hidden in the letters of 'carmen'.
'with a' is the link.
(Other definitions for arm that I've seen before include "Part of chair" , "What soldiers do" , "Equip with weapon" , "ready for war" , "Body part" .)