Extra protection of information from computer discussed (7)
I believe the answer is:
redoubt
'extra protection' is the definition.
(military term)
'information from computer discussed' is the wordplay.
'information from computer' becomes 'readout'.
'discussed' shows a homophone (sound like).
'readout' is a homophone of 'REDOUBT'.
'of' is the link.
(Other definitions for redoubt that I've seen before include "21 ac fortification" , "fortress" , "In final retreat" , "Keep losing confidence in" , "Tube rod (anag) - fortification" .)