Red setter, perhaps? (3)
I believe the answer is:
sun
'red setter' is the definition.
'sun' can be an answer for 'setter' (the sun sets every day). I am unsure of the 'red' bit.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for sun that I've seen before include "Get a tan" , "It's sol in Latin" , "Our central star" , "Earth's nearest star" , "Centre of Earth's orbit" .)