Posted problem over the weekend from computer
I believe the answer is:
desktop
'computer' is the definition.
(desktop computer is a kind of computer)
'posted problem over the weekend' is the wordplay.
'problem' is an anagram indicator.
'over' indicates putting letters inside.
'the weekend' becomes 'k' (I've seen this in other clues).
'posted' is an anagram of 'destop'.
'destop' placed around 'k' is 'DESKTOP'.
'from' acts as a link.
(Other definitions for desktop that I've seen before include "often supports a mass of papers?" , "Working surface, computer screen area" , "Like a computer system" , "Work surface; computer type" , "Main working area of PC" .)