In Tiepolo, a notable advance (4)
I believe the answer is:
loan
'advance' is the definition.
(I've seen this before)
'in tiepolo a notable' is the wordplay.
'in' says the answer is hidden in the clue.
'LOAN' is hidden in the letters of 'tiepolo a notable'.
(Other definitions for loan that I've seen before include "Temporary provision of money" , "It's given temporarily" , "Act of lending" , "Overdraft" , "Money borrowed at interest" .)