Crossword Genius

Dog reminding one of the sun on a fine evening? (3,6)

Ross

I believe the answer is:

red setter

I'm a little stuck... Click here to teach me more about this clue!

'dog' is the definition.
(red setter is a kind of dog)

'reminding one of the sun on a fine evening?' is the wordplay.
I cannot really understand how this works, but
'sun' could be 's' and 's' is located in the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for red setter that I've seen before include "Shepherds are delighted to see this" , "Barker" , "description of evening sun?" , "Gun dog" , "one identifying the game" .)

I've seen this clue in the Evening Standard.
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