Regard admissions of debt as flippant (9)
I believe the answer is:
facetious
'flippant' is the definition.
(I've seen this before)
'regard admissions of debt' is the wordplay.
'regard' becomes 'facet' (both can mean a view or aspect).
'admissions of debt' becomes 'IOUs' (I Owe You's).
'facet'+'ious'='FACETIOUS'
'as' acts as a link.
(Other definitions for facetious that I've seen before include "Waggish" , "Inappropriately humorous" , "Jocular; frivolous" , "Intended to be amusing or witty" , "Tongue-in-cheek" .)