Watches foreign money - not a pretty sight (7)
I believe the answer is:
eyesore
'not a pretty sight' is the definition.
(I've seen this in another clue)
'watches foreign money' is the wordplay.
'watches' becomes 'eyes' (to eye is to watch or look at).
'foreign money' becomes 'ore' (I've seen this before).
'eyes'+'ore'='EYESORE'
(Other definitions for eyesore that I've seen before include "Something ugly to look at" , "Ugly object, hard on the sight" , "An unsightly thing" , "A monstrous carbuncle" , "Unpleasant sight" .)