Detailed, thorough (2-5)

I think it could be either:

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2-5

in-depth

I believe this is a double definition.

'detailed' is the first definition.
(I've seen this before)

'thorough' is the second definition.
(I've seen this before)

(Other definitions for in-depth that I've seen before include "Detailed and thorough" , "Profoundly (studied)" , "Thorough and intensive" , "Comprehensive and thorough" , "Detailed (investigation)" .)

I've seen this clue in The Times.

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