Painting and design for a lower court (11)
I believe the answer is:
watercolour
'painting' is the definition.
(I know that watercolour is a type of painting)
'design for a lower court' is the wordplay.
'design for' is an anagram indicator (I've seen 'designed for' mean this (letters re-designed)).
'a'+'lower'+'court'='alowercourt'
'alowercourt' is an anagram of 'WATERCOLOUR'.
'and' is the link.
(Other definitions for watercolour that I've seen before include "Painted picture" , "Type of painting" .)