Terribly angered! (7)

I believe the answer is:

enraged

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'terribly angered' is the definition.
'enraged' can be an answer for 'angered' (synonyms). I am unsure of the 'terribly' bit.

'terribly angered' is the wordplay.
'terribly' is an anagram indicator.
'angered' with letters rearranged gives 'ENRAGED'.

Can you help me to learn more?

(Other definitions for enraged that I've seen before include "on the warpath?" , "Infuriated, made mad" , "Wild" , "Angered (anag) - extremely so!" , "Wound up" .)

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

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