Scale of crime otherwise confined to hostility (8)

I believe the answer is:

enormity

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'scale of crime' is the definition.
'enormity' can be an answer for 'crime' (I have seen 'Grave crime ' mean 'enormity' so perhaps 'crime' could also mean 'enormity'). I'm not sure about the 'scale of' bit.

'otherwise confined to hostility' is the wordplay.
'otherwise' becomes 'or'.
'confined to' indicates putting letters inside.
'hostility' becomes 'enmity' (synonyms).
'or' placed into 'enmity' is 'ENORMITY'.

Can you help me to learn more?

(Other definitions for enormity that I've seen before include "Great wickedness or huge size" , "Evil" , "Vastness - great crime" , "Outrageous deed" , "Extreme wickedness or vastness" .)

I've seen this clue in The Telegraph.

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