Started with flan (4)
I believe the answer is:
tart
'flan' is the definition.
(thesaurus)
'started with' is the wordplay.
'with' indicates a hidden word.
'TART' can be found hidden inside 'started'.
(Other definitions for tart that I've seen before include "Flan; acidic" , "Short; tangy" , "quiche, perhaps" , "Of taste, sharp or acid" , "Biting; flan" .)