Boring unruly adolescent with debts? (7)
I believe the answer is:
tedious
'boring' is the definition.
('tedious' can be a synonym of 'boring')
'unruly adolescent with debts?' is the wordplay.
'unruly adolescent' becomes 'ted' (reference to Teddy Boy subculture).
'with' is a charade indicator (letters next to each other).
'debts?' becomes 'ious'.
'ted'+'ious'='TEDIOUS'
(Other definitions for tedious that I've seen before include "not worth listening to?" , "Outside (anag.)" , "Humdrum" , "flat" , "Dull as ditchwater" .)