A tasteful colour (6)
I believe the answer is:
orange
'colour' is the definition.
(I know that orange is a type of chromatic color)
'a tasteful' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for orange that I've seen before include "Order of the North" , "Fruit - part of the spectrum" , "Name of reigning house of the Netherlands" , "Onager (anag.)" , "Royal house - fruit - colour" .)