Nasty slide doesn't work (5)
I believe the answer is:
idles
'doesn't work' is the definition.
(I've seen this in another clue)
'nasty slide' is the wordplay.
'nasty' is an anagram indicator (a nasty or wrong spelling).
'slide' is an anagram of 'IDLES'.
(Other definitions for idles that I've seen before include "Of engine, just ticks over in neutral" , "Does little, just ticks over" , "Spends time doing nothing" , "Lazes around" , "Avoids working" .)