Classification of Tom Cruise trailer: gruesome (8)

I believe the answer is:

category

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

'tom cruise trailer gruesome' is the wordplay.
'tom' becomes 'cat' (a tom is a male cat).
'cruise trailer' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'gruesome' becomes 'gory' (I've seen this in another clue).
'cat'+'e'+'gory'='CATEGORY'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for category that I've seen before include "Grey coat (anag.)" , "Type" , "Class or division of similar subjects" , "Class of grey-coat" , "Class or order" .)

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

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