Clue: Behind short film supporting revised rate for hearing aid (3,7)
Answer: EAR TRUMPET
Explanation: Definition: hearing aid 
**RUMP **("behind") + **ET** ("film") *supporting* ***(rate) **[*revised*] 
*The "short" may be indicating that the film is actually called *E.T.: The Extra Terrestrial,* but it could be considered superfluous as most people know the movie simply as *E.T.