Note about tailless donkey’s short break down under (5)

I believe the answer is:

smoko

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'short break down under' is the definition.
I can't judge whether this defines the answer.

'note about tailless donkey's' is the wordplay.
'note' becomes 'so' (musical note).
'about' indicates putting letters inside.
'tailless' means to remove the last letter (the tail of the word is removed).
'donkey' becomes 'moke' (moke can informally mean a donkey).
'moke' with its last letter taken away is 'mok'.
'so' going around 'mok' is 'SMOKO'.

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(Another definition for smoko that I've seen is " rest down under".)

I've seen this clue in The Times.

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