'Moneybags' Nick admits personal hygiene problem (5)
I believe the answer is:
nabob
'moneybags' is the definition.
(I've seen this before)
'nick admits personal hygiene problem' is the wordplay.
'nick' becomes 'nab' (both can mean steal).
'admits' means one lot of letters goes inside another (to admit is to allow in).
'personal hygiene problem' becomes 'bo' (I can't justify this - if you can you should give a lot more credence to this answer).
'nab' enclosing 'bo' is 'NABOB'.
Can you help me to learn more?
(Other definitions for nabob that I've seen before include "Powerful man" , "Mogul governor; very rich or important person" , "Wealthy influential person" , "Mogul governor; rich man" , "VIP" .)