One who detests holding up trade group, creating touble (3,5)
I believe the answer is:
hot water
'one who detests holding up trade group creating touble' is the definition.
The definition suggests a singular noun which matches the answer.
'one who detests holding up trade group' is the wordplay.
'one who detests' becomes 'hater' (I've seen this in another clue).
'holding' is an insertion indicator.
'up trade group' becomes 'otw' (I am not sure about this - if you are sure you should believe this answer much more).
'hater' placed around 'otw' is 'HOT WATER'.
Can you help me to learn more?
(Other definitions for hot water that I've seen before include "(Wet?) trouble" , "A state of trouble" , "Possible boiler" , "(Liquid) trouble!" , "that comes at bath time?" .)