Arty form of salver? (4)
I believe the answer is:
tray
'salver?' is the definition.
(salver is a kind of tray)
'arty form' is the wordplay.
'form' indicates an anagram.
'arty' with letters rearranged gives 'TRAY'.
'of' acts as a link.
(Other definitions for tray that I've seen before include "Shallow receptable for carrying something" , "platter" , "Flat board for carrying things" , "food container" , "three" .)