Crossword Genius

With this spy might be quietly intrusive (4)

Ross

I believe the answer is:

nosy

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'intrusive' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for nosy that I've seen before include "Inquisitive in nasal manner" , "Meddlesome" , "Intrusive in nasal way" , "Prying, snoopy" , "Showing too much curiosity about people's affairs" .)

I've seen this clue in The Independent.
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