One's intended to bank note as money (7)
I believe the answer is:
finance
'money' is the definition.
(finance is the management of money)
'one's intended to bank note' is the wordplay.
'one's intended' becomes 'fiance' (who somebody intends to marry).
'to bank' indicates putting letters inside (outside letters create limits or banks).
'note' becomes 'n' (abbreviation).
'fiance' going around 'n' is 'FINANCE'.
'as' acts as a link.
(Other definitions for finance that I've seen before include "See 9" , "Money affairs" , "Supporting rhino" , "Monetary support" , "Fund" .)