Delighted to say it's money (4)
I believe the answer is:
cent
'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' shows a homophone (sound like).
'sent' sounds like 'CENT'.
'it's' acts as a link.
(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" .)