The crime's solved and perfectly closed (8)

I believe the answer is:

hermetic

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'perfectly closed' is the definition.
'hermetic' can be an answer for 'closed' (thesaurus). I am not sure about the 'perfectly' bit.

'the crime's solved' is the wordplay.
'solved' indicates anagramming the letters (the anagram must be solved).
'the'+'crime'='thecrime'
'thecrime' with letters rearranged gives 'HERMETIC'.

'and' is the link.

Can you help me to learn more?

(Other definitions for hermetic that I've seen before include "Sealed so as to be airtight" , "Completely sealed" .)

I've seen this clue in the Sydney Morning Herald.

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