American's sweet, spouting endless foolish hype (7,3)
I believe the answer is:
shoofly pie
'american's sweet' is the definition.
(shoofly pie is a type of American sweet)
'spouting endless foolish hype' is the wordplay.
'spouting' is an anagram indicator.
'endless' means to remove the last letter.
'foolish' with its final letter removed is 'foolis'.
'foolis'+'hype'='foolishype'
'foolishype' is an anagram of 'SHOOFLY PIE'.
(Other definitions for shoofly pie that I've seen before include "American food" , "Stateside tart" .)