Sound of the kookaburra? (4)

I believe the answer is:

burr

'sound' is the definition.
(I have seen 'Rough sound' mean 'burr' so perhaps 'sound' could also mean 'burr')

'of the kookaburra?' is the wordplay.
'of' indicates a hidden word.
'BURR' is hidden in the letters of 'kookaburra'.

(Other definitions for burr that I've seen before include "Type of seed with short stiff bristles or hooks" , "Prickly seed container - regional accent" , "manner of speaking)" , "tends to stick?" , "Whirring sound or plant seed-case that sticks" .)

I've seen this clue in the Evening Standard.

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