Cell phone drivers corrupted games, essentially (4)

I believe the answer is:

ovum

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'cell' is the definition.
(an ovum is an egg cell)

I don't understand how the remainder of the clue works.

(Other definitions for ovum that I've seen before include "Female gamete" , "Human egg cell" , "Female reproductive cell" , "Reproductive cell, 'egg' in Latin" , "bit of life potentially" .)

I've seen this clue in The Times.

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