Capable of making mistakes (8)
I believe the answer is:
fallible
'capable of making mistakes' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fallible that I've seen before include "Bali fell (anag)" , "errant, possibly" , "Capable of making mistakes" , "apt to err" , "Capable of error, liable to make mistakes" .)