A red setter, perhaps (3)
I believe the answer is:
sun
'a red setter' is the definition.
'sun' can be an answer for 'setter' (the sun sets every day). I am not certain of the 'a red' bit.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for sun that I've seen before include "Star; newspaper" , "Our central star" , "It's sol in Latin" , "Star; paper" , "Star round which we orbit" .)