Get old school guy with money to entertain area (6)
I believe the answer is:
obtain
'get' is the definition.
(I know that get can be written as obtain)
'old school guy with money to entertain area' is the wordplay.
'old school guy' becomes 'OB' (short for Old Boy, private school alumnus).
'with' says to put letters next to each other.
'money' becomes 'tin' (old-fashioned slang term for money).
'to entertain' is an insertion indicator.
'area' becomes 'a' (maths abbreviation).
'tin' going around 'a' is 'tain'.
'ob'+'tain'='OBTAIN'
(Other definitions for obtain that I've seen before include "Get, procure" , "Take possession of" , "Get or lay hold of" , "Get or receive" , "Get - secure" .)