### Clue: Observe sudden rush to receive shock treatment (8)
### Answer: SPECTATE 
 ### Explanation: Definition: Observe
  SPATE(a sudden rush,outpouring,flood,downpour) **containing**(to receive) ECT(outmoded, I hope, shock treatment,medically called $$e$$lectro$$c$$onvulsive $$t$$reatment)
Defn:  A word back-formed from the noun "spectator" – not sure if it's an Americanism, or home-grown in England.  Doesn't quite roll easily off my tongue.