Random hissing not shifting (6)

I believe the answer is:

static

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'random hissing' is the definition.
'static' can be an answer for 'hissing' (I've seen this before). I'm unsure of the 'random' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for static that I've seen before include "Crackling or hissing noise caused by electrical interference" , "Still - crackling on the radio" , "Constant interference" , "showing no signs of going anywhere" , "Stuck in a traffic jam" .)

I've seen this clue in The Times.

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