Liable to err (8)
I believe the answer is:
fallible
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">liable to err</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fallible that I've seen before include "Likely to fail or make errors" , "errant, possibly" , "Weak" , "Bali fell (anag)" , "Capable of being wrong" .)