Hardly the only one in a quiver! (5)
I believe the answer is:
arrow
'one in a quiver' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for arrow that I've seen before include "Indicator; missile" , "Missile fired from bow" , "production of Fletcher?" , "William Tell's missile" , "Item in a quiver" .)