Crossword Genius

Refers to more advanced technology used to describe person whose grandparents were immigrants (5-10)

Ross

I believe the answer is:

third-generation

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'refers to more advanced technology used to describe' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'person whose grandparents were immigrants' is the wordplay.
I cannot really understand how this works, but
'person' could be 'rat' (rat is a kind of person) and 'rat' is located in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Irish Times.
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