Donald Duck inside with a bed cover (5)

I believe the answer is:

doona

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'bed cover' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'donald duck inside with a' is the wordplay.
'donald duck' becomes 'doo' (I can't justify this - if you can you should give a lot more credence to this answer).
'inside' says to take the centre.
'with' becomes 'and'.
The middle letter of 'and' is 'n'.
'doo'+'n'+'a'='DOONA'

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

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