Possible Clues:

• Drinking companion possibly overturned computer
• Convenience for working travelers
• Computer for one who's on the go
• Threaten to produce overflow in computer
• Friend coming back with excellent computer
• Portable personal computer
• Dope linked to 'friend' over computer
• Computer in a messenger bag
• Characters in 17 across return to Cork with one of those carrying the files
• Drink with container overturned. Apple perhaps?