One possibly barking puzzle supplier for the Morning Star? (3,6)
I believe the answer is:
red setter
'one possibly barking' is the definition.
(I know that dog often perform the action bark)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for red setter that I've seen before include "Barker" , "Shepherds are delighted to see this" , "Breed of dog" , "one identifying the game" , "supplier of crosswords to the Daily Worker?" .)