Public anger — and love — for America is excessive (10)
I believe the answer is:
outrageous
'excessive' is the definition.
(thesaurus)
'public anger and love for america' is the wordplay.
'public' becomes 'out' (I've seen this before).
'anger' becomes 'rage' (rage is a kind of anger).
'and' says to put letters next to each other.
'love for' becomes 'o' (I've seen this in other clues).
'america' becomes 'us' (abbreviation for the United States).
'out'+'rage'+'o'+'us'='OUTRAGEOUS'
'is' acts as a link.
(Other definitions for outrageous that I've seen before include "Exorbitant" , "undignified" , "Shocking" .)