DOS kept crashing computer (7)
I believe the answer is:
desktop
'computer' is the definition.
(desktop computer is a kind of computer)
'dos kept crashing' is the wordplay.
'crashing' indicates an anagram.
'dos'+'kept'='doskept'
'doskept' anagrammed gives 'DESKTOP'.
(Other definitions for desktop that I've seen before include "Location of icons" , "Office work surface" , "working area in office" , "often supports a mass of papers?" , "Kind of PC (for publishing?)" .)