Chest scanner envelops extremely sick European (6)

I believe the answer is:

casket

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'chest' is the definition.
(I have seen 'Small chest' mean 'casket' so perhaps 'chest' could also mean 'casket')

'scanner envelops extremely sick european' is the wordplay.
'scanner' becomes 'cat' (I can't justify this - if you can you should believe this answer much more).
'envelops' indicates putting letters inside (I've seen this in other clues).
'extremely' says to hollow out the word (remove centre letters).
'european' becomes 'e' (abbreviation e.g. EU).
'sick' with its middle taken out is 'sk'.
'sk'+'e'='ske'
'cat' enclosing 'ske' is 'CASKET'.

Can you help me to learn more?

(Other definitions for casket that I've seen before include "Helping boost" , "Jewel-box" , "Small box or chest" , "Box for jewellery, or corpse" , "Ornamental chest" .)

I've seen this clue in The Telegraph.

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