Money can be converted into capital (7)
I believe the answer is:
finance
'money' is the definition.
(finance is the management of money)
'can be converted into capital' is the wordplay.
'be converted' indicates an anagram.
'into' means one lot of letters goes inside another.
'capital' becomes 'fine' (I am not sure about this - if you are sure you should believe this answer much more).
'can' is an anagram of 'anc'.
'anc' placed inside 'fine' is 'FINANCE'.
Can you help me to learn more?
(Other definitions for finance that I've seen before include "Support monetarily" , "Money management" , "See 9" , "Monetary support" , "Public money" .)