Crossword Genius

Ducks doctor holds closer? (4)

Ross

I believe the answer is:

door

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'ducks doctor holds closer?' is the definition.
I can't judge whether this definition defines the answer.

'ducks doctor holds' is the wordplay.
'ducks' becomes 'OO' (duck means zero in cricket).
'doctor' becomes 'dr' (abbreviation).
'holds' indicates putting letters inside.
'oo' going within 'dr' is 'DOOR'.

Can you help me to learn more?

(Other definitions for door that I've seen before include "Opener" , "Barrier to open and close" , "Entrance to room, house etc" , "Entrance way" , "Entrance barrier" .)

I've seen this clue in The Sun.
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