Crossword Genius

Detailed plans originally kept in tin he'd tampered with (2-5)

Ross

I believe the answer is:

in-depth

(Other definitions for in-depth that I've seen before include "Comprehensive and thorough" , "Thoroughly and comprehensively" , "Getting to the bottom of it" , "Full" , "Detailed and thorough" .)

I've seen this clue in The Independent.
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