Arrow case (6)
I believe the answer is:
quiver
'arrow case' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for quiver that I've seen before include "Tremble - case for arrows" , "Receptacle in which archer keeps arrows" , "Tremble and shake, or receptacle for arrows" , "Arrow case" , "Wobble" .)