Crossword Genius

Improved mobile design added to electronic department (6)

Ross

I believe the answer is:

mended

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'improved' is the definition.
(mending is a kind of improving)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for mended that I've seen is " Repaired, fixed".)

I've seen this clue in The Times and The Sunday Times.
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