Heavenly colour? (3,4)
I believe the answer is:
sky blue
'heavenly colour?' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sky blue that I've seen before include "Seeing this, one may be looking up" , "clear as day" , "Colour overhead on a fine day" , "Pale colour -- buy elks (anag)" , "Colour of the heavens" .)