Beast, about to start sleeping, is drawn out (5,2)

I believe the answer is:

drags on

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'is drawn out' is the definition.
I can't tell whether this definition defines the answer.

'beast about to start sleeping' is the wordplay.
'beast' becomes 'dragon' (I have seen 'Mythical beast ' mean 'dragon' so perhaps 'beast' could also mean 'dragon').
'about' is an insertion indicator.
'to start' indicates taking the first letters.
The initial letter of 'sleeping' is 's'.
'dragon' enclosing 's' is 'DRAGS ON'.

Can you help me to learn more?

(Another definition for drags on that I've seen is " Lasts interminably".)

I've seen this clue in the Sydney Morning Herald.

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