The computer system, albeit full of holes (3)
I believe the answer is:
net
'the computer system' is the definition.
'net' can be an answer for 'system' (net is a kind of system). I am not certain of the 'the computer' bit.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for net that I've seen before include "Fine open-weave fabric" , "Mesh; entrap" , "Amount remaining after deductions" , "Catch, ensnare" , "Overall; mesh" .)