One's intended to collect new money (7)
I believe the answer is:
finance
'money' is the definition.
(finance is the management of money)
'one's intended to collect new' is the wordplay.
'one's intended' becomes 'fiance' (who somebody intends to marry).
'to collect' means one lot of letters goes inside another (inserted letters are collected by others).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'fiance' placed around 'n' is 'FINANCE'.
(Other definitions for finance that I've seen before include "See 9" , "Provide capital" , "Provide funds for" , "Monetary support" , "Supporting rhino" .)