Sad - like an unclouded sky? (4)
I believe the answer is:
blue
This clue could be a double definition.
'sad' is the first definition.
(I know that sad can be written as blue)
'an unclouded sky?' is the second definition.
'blue' can be an answer for 'sky?' (blue is a kind of sky). I am not sure about the 'an unclouded' bit.
'like' is the link.
Can you help me to learn more?
(Other definitions for blue that I've seen before include "Oxbridge sports award" , "The colour of melancholy" , "Sea colour" , "Woodland flower" , "Sunny sky or low spirits" .)