Upset hot water (7)
I believe the answer is:
trouble
I believe this clue is a double definition.
'upset' is the first definition.
(troubling is a kind of upseting)
'hot water' is the second definition.
(I've seen this before)
(Other definitions for trouble that I've seen before include "Misfortune" , "Affliction" , "Hassle" , "Difficulty, care, worry" , "Strife, difficulty" .)