One taken with the net, perhaps, using computer — one only (7)
I believe the answer is:
halibut
'one taken with the net perhaps' is the definition.
I can't judge whether this definition defines the answer.
'computer one only' is the wordplay.
'computer one' becomes 'hali' (I am not sure about this - if you are sure you should believe this answer much more).
'only' becomes 'but' (but can mean only - eg 'life is but a dream').
'hali'+'but'='HALIBUT'
'using' acts as a link.
Can you help me to learn more?
(Other definitions for halibut that I've seen before include "Largest flatfish" , "Large food fish" , "Fish found in Bali hut" , "Large edible flatfish" , "Fishy sort" .)