A thing that goes •hrrr' in the night (5)

I believe the answer is:

snore

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'a thing that goes hrrr' in the night' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is all the clue.

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(Other definitions for snore that I've seen before include "Noise from a sleeper" , "Make raucous nocturnal noise" , "Raucous sound while sleeping" , "Noise indicating sleep" , "Make racous nocturnal sound" .)

I've seen this clue in the Evening Standard.

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