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It disappears when filled (7)

Ross

I believe the answer is:

vacancy

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'it disappears when filled' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for vacancy that I've seen before include "Unoccupied post" , "Lack of consideration" , "Unoccupied situation" , "An opening, job or apartment" , "Unoccupied state, job or apartment" .)

I've seen this clue in The Irish News.
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