Crossword Genius

Uncomfortable in someone else's house? (3,2,4)

Ross

I believe the answer is:

not at home

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'someone else's house?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'uncomfortable in' is the wordplay.
'uncomfortable' becomes 'not' (I can't explain this - if you can you should believe this answer much more).
'in' becomes 'at home' (someone at home is 'in').
'not'+'athome'='NOT AT HOME'

Can you help me to learn more?

(Other definitions for not at home that I've seen before include "barking at the moon" , "Ignoring visitors" .)

I've seen this clue in the Evening Standard.
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