Place for some horse trading (3)
I believe the answer is:
set
'place' is the definition.
(I've seen this before)
'some horse trading' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'SET' is hidden in the letters of 'horse trading'.
'for' acts as a link.
(Other definitions for set that I've seen before include "Group of items of the same kind" , "Major segment of tennis match" , "Hard; place" , "Prepared" , "exclusive party" .)