Shock dropping resistance for power cut (6)

I believe the answer is:

outage

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'power cut' is the definition.
(an outage is a loss of power)

I can't explain the remainder of the clue.

(Other definitions for outage that I've seen before include "Temporary suspension of operation" , "time of no power" , "Power cut" , "When one lacks power" , "Gap in power supply" .)

I've seen this clue in The Telegraph.

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