Drood appears in opened window (5)

I believe the answer is:

edwin

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'drood' is the definition.
I can't judge whether this defines the answer.

'in opened window' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EDWIN' can be found hidden inside 'opened window'.

'appears' is the link.

Can you help me to learn more?

(Other definitions for edwin that I've seen before include "and 21 Across: Dickens character" , "Dickens novel 'The Mystery of . . . . . Drood'" , "old king" , "Anglo-Saxon King" , "Old king's" .)

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

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