Separate stands put up to take in golf (9)
I believe the answer is:
segregate
'separate' is the definition.
(segregating is a kind of separating)
'stands put up to take in golf' is the wordplay.
'stands put' becomes 'etageres' (I am not sure about this - if you are sure you should believe this answer much more).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'to take in' means one lot of letters goes inside another.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'etageres' written backwards gives 'seregate'.
'seregate' enclosing 'g' is 'SEGREGATE'.
Can you help me to learn more?
(Other definitions for segregate that I've seen before include "Isolate with Easter Egg" , "Seperate from Easter egg" , "set apart from others" , "Keep apart" , "Cut off" .)