Broadway's Bernadette (6)
I believe the answer is:
peters
'broadway's bernadette' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for peters that I've seen before include "our 1/4 Across [GOLD MEDALLIST] in 1972" , "Mary - - , Olympian" , "25 15 [GOLDMEDALLIST]" .)