Crossword Genius

Pet in the evening sun (3,6)

Ross

I believe the answer is:

red setter

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'pet' is the definition.
(I've seen this before)

'in the evening sun' is the wordplay.
'in the' becomes 'red' (I am not sure about this - if you are sure you should believe this answer much more).
'evening sun' becomes 'setter' (the sun sets in the evening).
'red'+'setter'='RED SETTER'

Can you help me to learn more?

(Other definitions for red setter that I've seen before include "supplier of crosswords to the Daily Worker?" , "description of evening sun?" , "My best friend" , "Barker" , "Pet" .)

I've seen this clue in The Mirror.
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