Puts son out; gets a freckle (7)
I believe the answer is:
sunspot
'a freckle' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'puts son out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'puts'+'son'='putsson'
'putsson' with letters rearranged gives 'SUNSPOT'.
'gets' is the link.
Can you help me to learn more?
(Other definitions for sunspot that I've seen before include "Solar cool patch" , "holiday resort" , "Solar dark patch" , "cause of magnetic storm" , "Dark cool patch on the surface of our nearest star" .)