Drop bile about being error-prone (8)
I believe the answer is:
fallible
'error-prone' is the definition.
(similar in meaning)
'drop bile about' is the wordplay.
'drop' becomes 'fall' (synonyms).
'about' is an anagram indicator.
'bile' with letters rearranged gives 'ible'.
'fall'+'ible'='FALLIBLE'
'being' is the link.
(Other definitions for fallible that I've seen before include "Bali fell (anag)" , "Capable of being wrong" , "errant, possibly" , "Liable to err" , "Northern Scandinavian" .)