Peculiar scoundrel with admissions of debt (7)
I believe the answer is:
curious
'peculiar' is the definition.
('curious' can be a synonym of 'peculiar')
'scoundrel with admissions of debt' is the wordplay.
'scoundrel' becomes 'cur' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'admissions of debt' becomes 'ious' (I've seen this in other clues).
'cur'+'ious'='CURIOUS'
(Other definitions for curious that I've seen before include "Eager to know; strange" , "Eager to learn something" , "Questioning" , "Strange - inquisitive" , "Odd or eager to know" .)