The colour of a Dutch house (6)
I believe the answer is:
orange
I believe this is a double definition.
'the colour' is the first definition.
(orange is a kind of colour)
'a dutch house' is the second definition.
(I've seen this before)
'of' acts as a link.
(Other definitions for orange that I've seen before include "stocking filler" , "Princely house" , "Dutch royal house" , "Order of the North" , "Colour of Northern Ireland unionism" .)