Gold entrance initially was sweet (6)
I believe the answer is:
gateau
'sweet' is the definition.
(type of dessert or sweet)
'gold entrance initially' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'entrance' becomes 'gate' (type of entrance).
'initially' is a charade indicator (letters next to each other) (some letters go before others).
'au' after 'gate' is 'GATEAU'.
'was' acts as a link.
(Other definitions for gateau that I've seen before include "(French?) cake" , "Cake for Pierre" , "Rich cream cake" , "Richly decorated cake" , "Elaborate cake" .)