Misrepresent the investments of gauche lord (5)
I believe the answer is:
liege
'gauche lord' is the definition.
'liege' can be an answer for 'lord' (feudal term for a superior). I am not certain of the 'gauche' bit.
'misrepresent the investments' is the wordplay.
'misrepresent' becomes 'lie' (to lie about something is to misrepresent it).
'the investments' becomes 'ge' (I can't explain this - if you can you should believe this answer much more).
'lie'+'ge'='LIEGE'
'of' acts as a link.
(Other definitions for liege that I've seen before include "Faithful," , "Feudal lord or Belgian city" , "On about one East Belgium city" , "European province" , "Province of Belgium" .)