Being erroneous would be too much for him (3)
I believe the answer is:
ron
'him' is the definition.
(short for Ronald)
'being erroneous would be too much' is the wordplay.
'RON' is hidden in amongst the letters.
But, I'm unsure how the hidden word is indicated.
'for' is the link.
Can you help me to learn more?
(Other definitions for ron that I've seen before include "L. - Hubbard, US sci-fi writer" , "Short man's name" , "Shortened man's name" , "--- Weasley, Harry Potter pal" , "Boy's name (abbr)" .)