Sheer rip. perhaps (8)
I believe the answer is:
'sheer rip perhaps' is the definition.
I can't tell whether this definition defines the answer.
'sheer rip perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'sheerrip' with letters rearranged gives 'PERISHER'.
Can you help me to learn more?
(Other definitions for perisher that I've seen before include "pain" , "source of annoyance" , "One dies" , "Little imp" , "Annoying person" .)