Publisher of numerous titles retired, saddled with arrears (7)
I believe the answer is:
debrett
'publisher of numerous titles' is the definition.
I know nothing about this answer so I can't judge whether this works.
'retired saddled with arrears' is the wordplay.
I cannot really understand how this works, but
'retired' could be 'ret' (e.g. following the name of a retired army officer) and 'ret' is found within the answer.
'arrears' could be 'debt' (I've seen this in other clues) and 'debt' is present in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for debrett that I've seen before include "List of the British aristocracy" , "Peerage guide" , "Founder of book on the peerage" , "Man giving name to publishers best known for books on etiquette" , "Peerage reference book" .)