Debit card introduced in the UK in 1988 that merged with Maestro in 2002 (6)

I believe the answer is:

switch

(Other definitions for switch that I've seen before include "Device for changing electrical connections" , "Divert the electrical control" , "One may be off" , "Circuit-breaker" , "Change; flexible shoot" .)

I've seen this clue in The Independent.

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