Worried a contemptible chap and a delinquent youth (8)
I believe the answer is:
agitated
'worried' is the definition.
(I've seen this before)
'a contemptible chap and a delinquent youth' is the wordplay.
'a contemptible chap' becomes 'agita' (I can't explain this - if you can you should believe this answer much more).
'and' means one lot of letters go next to another.
'a delinquent youth' becomes 'ted' (member of the Teddy Boy subculture).
'agita'+'ted'='AGITATED'
Can you help me to learn more?
(Other definitions for agitated that I've seen before include "Worked up, flustered" , "Tried to stir up public opinion" , "Troubled, nervous" , "in troubled state" , "Aroused - disturbed" .)