He tangled with the mob, a monstrous thing (8)

I believe the answer is:
behemoth
'a monstrous thing' is the definition.
'behemoth' can be an answer for 'thing' (I have seen 'huge thing' mean 'behemoth' so perhaps 'thing' could also mean 'behemoth'). I am unsure of the 'a monstrous' bit.
'he tangled with the mob' is the wordplay.
'tangled with' indicates anagramming the letters.
'the'+'mob'='themob'
'he' with its letters mixed up with 'themob' makes 'BEHEMOTH'.
Can you help me to learn more?
(Other definitions for behemoth that I've seen before include "big beastly type" , "Something huge and monstrous" , "Huge organisation" , "Something abnormally large and powerful" , "Monster" .)
