Where to do some poaching, beset by trouble (2,3,5)
I believe the answer is:
in hot water
This clue is a double definition.
'where to do some poaching' is the first definition.
(eggs are poached in hot water)
'beset by trouble' is the second definition.
(to be in hot water is to be in trouble)
(Other definitions for in hot water that I've seen before include "Where eggs may be cooked" , "Facing reprimand" , "having a bath?" , "Bubbles may appear" , "Washing-up is done so" .)