Predict role left out (8)
I believe the answer is:
foretell
'predict' is the definition.
(I know that predict can be written as foretell)
'role left out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'role'+'left'='roleleft'
'roleleft' is an anagram of 'FORETELL'.
(Other definitions for foretell that I've seen before include "Prognosticate" , "Divine" , "Foreshadow or presage" , "supporting English archer" , "'Predict, prophesy (8)'" .)