Money gets yours truly in fix (6)
I believe the answer is:
cement
'fix' is the definition.
(I know that cement is a more specific form of the action fix)
'money gets yours truly' is the wordplay.
'money' becomes 'cent' (eg denomination of dollars).
'gets' means one lot of letters goes inside another (gets can mean captures or absorbs).
'yours truly' becomes 'me' (the person who set this crossword).
'cent' going around 'me' is 'CEMENT'.
'in' acts as a link.
(Other definitions for cement that I've seen before include "Material used by builders and dentists" , "It hardens when mixed with water" , "material for bonding" , "Seal; bonding agent" , "Union" .)