Crossword Genius

Unclear boundaries in this old people’s home? (4,4)

Ross

I believe the answer is:

grey area

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'unclear boundaries in this' is the definition.
The definition suggests a singular noun which matches the answer.

'old people's home?' is the wordplay.
'old' becomes 'grey' (similar in meaning).
'people's home?' becomes 'area' (I am not sure about this - if you are sure you should believe this answer much more).
'grey'+'area'='GREY AREA'

Can you help me to learn more?

(Other definitions for grey area that I've seen before include "Matter about which there is no certainty" , "Ill-defined zone" , "It's hard to describe precisely" , "What many pensioners have upstairs" , "Ill-defined situation" .)

I've seen this clue in The Sun.
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