Let down with bad debt across the new year (8)
I believe the answer is:
betrayed
'let down' is the definition.
(thesaurus)
'bad debt across the new year' is the wordplay.
'bad' indicates anagramming the letters.
'across' indicates putting letters inside.
'the new' indicates an anagram.
'debt' with letters rearranged gives 'betd'.
'year' is an anagram of 'raye'.
'betd' going around 'raye' is 'BETRAYED'.
'with' acts as a link.
(Other definitions for betrayed that I've seen before include "Double-crossed, abandoned" , "Unintentionally showed" , "Gave away" , "Double-crossed, was disloyal" , "Denounced" .)