Crossword Genius

To remove bugs from half of code, student replaces third of memory in peripheral (7)

Ross

I believe the answer is:

delouse

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'to remove bugs' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for delouse that I've seen before include "remove bugs" , "Get rid of lice" .)

I've seen this clue in The Telegraph.
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