Battery out: energy needed for computer storage (8)
I believe the answer is:
terabyte
'computer storage' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'battery out energy needed' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'energy' becomes 'e' (physics symbol as in E=mc2).
'needed' indicates putting letters inside.
'battery' is an anagram of 'trabyte'.
'trabyte' placed around 'e' is 'TERABYTE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for terabyte that I've seen before include "Large unit of computer memory" , "1000 gigabytes of data information" .)