Social media character maddened aghast husband (7)
I believe the answer is:
hashtag
'social media character maddened' is the definition.
I know nothing about this answer so I can't judge whether this works.
'aghast husband' is the wordplay.
I cannot really see how this works, but
an anagram of 'aghast' is 'ashtag' which is present in the answer.
'husband' could be 'h' (abbreviation) and 'h' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hashtag that I've seen before include "Number symbol" , "component of tweet" , "Word or phrase to aid online searches - hag's hat (anag)" , "Label on a tweet" , "Label on a message on Twitter" .)