Delighted to say it's money (4)
I believe the answer is:
cent
'it's money' is the definition.
(eg denomination of dollars)
'delighted to say' is the wordplay.
'delighted' becomes 'sent' (I've seen this in another clue).
'to say' indicates a 'sounds like' (homophone) clue.
'sent' is a homophone of 'CENT'.
(Other definitions for cent that I've seen before include "change from Colorado!" , "One-hundreth part of a currency" , "Small amount of money" , "Small change" , "One-hundredth of the value of the basic unit" .)