### Clue: Scouts do stick first of badges on right sleeve in the middle (8)
### Answer: JAMBOREE 
 ### Explanation: Definition: Scouts do
 JAM(to stick/to become unable to move or operate due a part adhering/sticking to something) + **1st letters, respectively, of**(first of) "badges on right" + **2 middle letters of**(… in the middle) "sleeve".
Defn: A large gathering/do of members of the Scout Association.