Weapon that might give fawning fellow backache? (7)
I believe the answer is:
longbow
'weapon' is the definition.
(I know that Longbow is a bow)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for longbow that I've seen before include "Mediaeval weapon" , "Weapon shooting arrows" , "Archer's weapon" , "Ancient weapon" , "Medieval weapon" .)