Some surfer - a serious wipe out! (5)
I believe the answer is:
erase
'wipe out' is the definition.
('erase' can be a synonym of 'wipe out')
'some surfer a serious' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ERASE' is hidden in the letters of 'surfer a serious'.
(Other definitions for erase that I've seen before include "Scratch" , "Rub out, cancel" , "Remove permanently" , "Take out" , "Remove recorded material" .)