Aesthetic tray design (4)
I believe the answer is:
arty
'aesthetic' is the definition.
(I've seen this in another clue)
'tray design' is the wordplay.
'design' is an anagram indicator.
'tray' with letters rearranged gives 'ARTY'.
(Other definitions for arty that I've seen before include "Bohemian" , "aspiring to be creative?" , "Culturally creative" , "Having exaggerated air of aesthetic interests" , "Like an aesthete" .)