Pelt American all round ring? That's horrid (7)
I believe the answer is:
hideous
'horrid' is the definition.
('hideous' can be a synonym of 'horrid')
'pelt american all round ring?' is the wordplay.
'pelt' becomes 'hide' ('hide' can be a synonym of 'pelt').
'american' becomes 'us'.
'all round' is an insertion indicator.
'ring?' becomes 'o'.
'hide'+'us'='hideus'
'hideus' placed around 'o' is 'HIDEOUS'.
'that's' is the link.
(Other definitions for hideous that I've seen before include "Frightful" , "Unsightly" , "Horrible" , "revolting" , "Ghastly" .)