Way in which you might make money abroad (4,6)
I believe the answer is:
wall street
'way in which you might make money abroad' is the definition.
'Wall Street' can be an answer for 'way' (Wall Street is an example). I am not certain of the remainder of the definition.
'way in which you might' is the wordplay.
'way' becomes 'wallst' (Wall St. is an example).
'in which' indicates putting letters inside.
'you might' becomes 'tree' (I am not sure about this - if you are sure you should believe this answer much more).
'wallst' enclosing 'tree' is 'WALL STREET'.
(Other definitions for wall street that I've seen before include "part of Manhattan" , "business centre" , "Finance hub" , "Film" , "NY financial area" .)