Crossword Genius

What the storm did, that upset Edgar (5)

Ross

I believe the answer is:

raged

I'm a little stuck... Click here to teach me more about this clue!

'what the storm did' is the definition.
I can't judge whether this definition defines the answer.

'upset edgar' is the wordplay.
'upset' indicates anagramming the letters.
'edgar' is an anagram of 'RAGED'.

'that' is the link.

Can you help me to learn more?

(Other definitions for raged that I've seen before include "Behaved violently" , "was having fits" , "Flipped one's lid" , "Showed violent anger" , "Spoke violently" .)

I've seen this clue in the Evening Standard.
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