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Late worker to close dryer, say (5,3)

Ross

I believe the answer is:

night owl

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'close dryer say' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'late worker' is the wordplay.
'late' becomes 'night' (I've seen this before).
'worker' becomes 'owl' (I can't justify this - if you can you should believe this answer much more).
'night'+'owl'='NIGHT-OWL'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for night owl that I've seen before include "he may go to bed at last" , "One active after dark" , "One working late" , "Late sleeper" , "One preferring to work when it's dark" .)

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