Peter of the Wailers (4)
I believe the answer is:
tosh
'peter of the wailers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tosh that I've seen before include "Hooey" , "garbage'" , "Rubbish; shot (anagram)" , "Nonsense (colloq.)" , "Humbug" .)