Electrical work isn't exactly tiring (6)

I believe the answer is:

wiring

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

I can't explain the rest of the clue.

(Other definitions for wiring that I've seen before include "Electrical network" , "electrical work" , "Building's electrical installation" , "Sending cables or telegrams" , "Arrangement of electrical connections" .)

I've seen this clue in the Evening Standard.

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