Money over and above the sovereign's capital (5)
I believe the answer is:
crown
'sovereign's capital' is the definition.
'crown' can be an answer for 'capital' (thesaurus). I'm not sure about the 'sovereign's' bit.
'money over and above' is the wordplay.
'money' becomes 'c'.
'over and above' becomes 'rown' (I am not sure about this - if you are sure you should believe this answer much more).
'c'+'rown'='CROWN'
'the' is the link.
Can you help me to learn more?
(Other definitions for crown that I've seen before include "Symbol of monarchy" , "Old five shilling piece" , "Diadem" , "The sovereign" , "honour" .)