Crossword Genius

With the contents removed - completely (6,3)

Ross

I believe the answer is:

inside out

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'completely' is the definition.
(thesaurus)

'with the contents removed' is the wordplay.
'with' says to put letters next to each other.
'the contents' becomes 'inside' (I can't explain this - if you can you should give a lot more credence to this answer).
'removed' becomes 'out' (taken out).
'inside' put next to 'out' is 'INSIDE-OUT'.

Can you help me to learn more?

(Other definitions for inside out that I've seen before include "how expert knows his trade?" , "Thoroughly" , "exposing the wrong face?" , "Turned to show the inner surface" , "comprehensively" .)

I've seen this clue in the Evening Standard.
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