One has a lot of trouble getting into this (3,5)
I believe the answer is:
hot water
'trouble getting into this' is the definition.
The definition suggests a singular noun which matches the answer. I also know that 'trouble' relates to this answer.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hot water that I've seen before include "Predicament to be avoided (informal)" , "Uncomfortable predicament to be in?" , "that comes at bath time?" , "(Wet?) trouble" , "Trouble or disgrace, being in thermal H2O" .)