Something needed for computer drive (3)
I believe the answer is:
ram
I believe this clue is a double definition.
'something needed for computer' is the first definition.
(random access memory)
'drive' is the second definition.
('ram' can be a synonym of 'drive')
(Other definitions for ram that I've seen before include "what comes after fish" , "barge" , "An animal; forcibly crash into" , "Crash into like male sheep" , "Aries is the Sign of the ..." .)