A moving example of art (6)
I believe the answer is:
mobile
This clue might be a double definition.
'a moving' is the first definition.
(I've seen this before)
'example of art' is the second definition.
'mobile' can be an answer for 'art' (mobile is a kind of art). I am not sure about the 'example of' bit.
Can you help me to learn more?
(Other definitions for mobile that I've seen before include "Free to move" , "Means of communicating" , "Able to move easily and quickly" , "Portable phone" , "Movable, phone say" .)