Bails out chap (5)
I believe the answer is:
basil
'chap' is the definition.
'bails out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'bails' with letters rearranged gives 'BASIL'.
(Other definitions for basil that I've seen before include "A herb; --- Brush, Fawlty" , "Aromatic herb in pesto" , "Bails out the herb" , "Fellow" , "Plant; Brush; Fawlty" .)