7)Greet Ms Saunders shortly
9)Extreme end colour
10)Shout to get someone's attention (coll) publicly criticise lose end 3
15)Pack farm baby to the ear, nose and throat hospital department
21)Normal level of quality hunt at night for rabbits
all answers are as near as possible to how they sound, and are related to light in that the item gives light, or may describe light.
As a matter of interest, I seized on 'ear, nose and throat' as being 'ent', so, all that I had to do was to find a baby farm animal to go in front of 'ent'.
In view of comments from Mamya and mallyh, I shall bow out, as gracefully as possible, and admit defeat. mallyh's answer fits the clue much better than does mine.