Terribly evil! (4)

I believe the answer is:

vile

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'terribly evil' is the definition.
'vile' can be an answer for 'evil' (I've seen this in another clue). I'm not certain of the 'terribly' bit.

'terribly evil' is the wordplay.
'terribly' is an anagram indicator.
'evil' is an anagram of 'VILE'.

Can you help me to learn more?

(Other definitions for vile that I've seen before include "Horrible" , "Evil - evil (anag)" , "Morally reprehensible" , "Live in degenerate way" , "Very nasty, quite evil" .)

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