Want to come over? (6)

I believe the answer is:

defect

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'want' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for defect that I've seen before include "Flaw - change sides" , "Want or imperfection" , "Desert - flaw" , "To change sides dishonourably" , "Desert and join the other side" .)

I've seen this clue in The Independent.

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