Set down inside computer (3)
I believe the answer is:
put
'set down' is the definition.
(I've seen this in another clue)
'inside computer' is the wordplay.
'inside' indicates a hidden word.
'PUT' can be found hidden inside 'computer'.
(Other definitions for put that I've seen before include "Place in a position" , "Set (in place)" , "Place; placed" , "Place, lay" , "Place in a location" .)