Celebrity chef who uses loads of sauce? (7)
I believe the answer is:
nigella
'celebrity chef' is the definition.
(TV chef Nigella Lawson)
I cannot understand how the remainder of the clue works.
(Other definitions for nigella that I've seen before include "Love-in-a-mist genus - celebrity cook" , "plant" , "Woman" , "Flower and TV chef" , "Flower and tv cook" .)