Setter unhappy when all becoming dimmer? (7)
I believe the answer is:
sundown
'all becoming dimmer?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'setter unhappy' is the wordplay.
'setter' becomes 'sun' (I've seen this in other clues).
'unhappy' becomes 'down' (I've seen this before).
'sun'+'down'='SUNDOWN'
'when' is the link.
Can you help me to learn more?
(Other definitions for sundown that I've seen before include "when night life would start?" , "Dusk" , "one time in the evening" , "Sunset" , "Close of day" .)