Everybody (3,3,6)
(Other definitions for all and sundry that I've seen before include "Every Tom, Dick and Harry" , "Absolutely everyone" , "Absolutely everybody" .)
'everybody' is the definition.
(all people)
This is the entire clue.
(Other definitions for all that I've seen before include "and 16 Across and 23 Across: Even so" , "without exception" , "Every single one" , "Fully clad ..." , "Garden path (Fr.)" .)
'everybody' is the definition.
(one and all can mean all people)
This is the entire clue.
(Other definitions for one and all that I've seen before include "Everybody without exception" , "Absolutely everybody" , "Everyman" .)