### Clue: Stumble at second hearing of panel (8)
### Answer: TRIPTYCH 
 ### Explanation: Definition: panel
 TRIP(a stumble) **plus**(at) **homophone of**(hearing) "tick"(a moment;a second, as in "hang on a tick!".
Answer: A set of 3 panels (or pictures) hinged together, often used as an altarpiece.