Crossword Genius

In safe? (2,4)

Ross

I believe the answer is:

at home

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This clue could be a double definition.

'in' is the first definition.
(someone at home is 'in')

'safe?' is the second definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?

Can you help me to learn more?

(Other definitions for at home that I've seen before include "Oh mate! (anag)" , "In (for a party?)" , "ready to receive visitors" , "celebration" , "In one's own house" .)

I've seen this clue in The Telegraph.
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