Stormed, to Edgar's distress (5)
I believe the answer is:
raged
'stormed' is the definition.
('rage' can be a synonym of 'storm')
'edgar's distress' is the wordplay.
'distress' indicates an anagram.
'edgar' is an anagram of 'RAGED'.
'to' is the link.
(Other definitions for raged that I've seen before include "Felt intense anger" , "Was violently angry" , "Expressed intense anger" , "Spoke violently" , "expressed vitriol?" .)