One dividing my wealth (5)
I believe the answer is:
money
'wealth' is the definition.
(I know that money is a type of wealth)
'one dividing my' is the wordplay.
'dividing' is an insertion indicator (inserted letters divide the word).
'one' going into 'my' is 'MONEY'.
(Other definitions for money that I've seen before include "Bread" , "tin" , "See 7" , "'A fool and his.....are soon parted'" , "Medium of exchange" .)