Charlatan brings endless humiliation (4)
I believe the answer is:
sham
'charlatan' is the definition.
(thesaurus)
'endless humiliation' is the wordplay.
'endless' means to remove the last letter.
'humiliation' becomes 'shame' (I've seen this before).
'shame' with its last letter taken off is 'SHAM'.
'brings' acts as a link.
(Other definitions for sham that I've seen before include "False and phoney" , "Mash, being false" , "Pretense; bogus" , "charade" , "Mash, being counterfeit" .)