Empty new flat on the top floor? (5)

I believe the answer is:

aloft

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'empty new flat on the top floor?' is the definition.
I can't judge whether this definition defines the answer.

'empty new flat on' is the wordplay.
'empty' becomes 'o' ().
'new' indicates anagramming the letters.
'on' indicates putting letters inside (as in clothing 'on' a person).
'flat' anagrammed gives 'alft'.
'o' put into 'alft' is 'ALOFT'.

Can you help me to learn more?

(Other definitions for aloft that I've seen before include "Heading for heaven" , "up the mast" , "Up in the sky" , "Float (anag.)" , "Animistic cult" .)

I've seen this clue in The Globe and Mail.

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