Slide in flexible disk (4)
I believe the answer is:
skid
'slide' is the definition.
(I know that slide can be written as skid)
'flexible disk' is the wordplay.
'flexible' is an anagram indicator (I've seen this in other clues).
'disk' with letters rearranged gives 'SKID'.
'in' acts as a link.
(Other definitions for skid that I've seen before include "potential cause of accident" , "go out of control" , "Slide fast" , "Runn" , "Slither out of control" .)