Artist Warhol (4)
I believe the answer is:
'artist warhol' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for andy that I've seen before include "- Warhol, twentieth century US artist" , "Andrew (dim.)" , "- - Warhol (art)" , "- Pandy, children's TV series" , "Chap" .)