A change in current consumption? (6)

I believe the answer is:

switch

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'a change' is the definition.
(switch is a kind of change)

I can't explain the rest of the clue.

(Other definitions for switch that I've seen before include "Device for changing electrical connections" , "Contact maker or breaker" , "Change over - long twig" , "Device for opening or closing a circuit" , "Change; hair-piece" .)

I've seen this clue in the Evening Standard.

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