Everything or everyone (3)
I believe the answer is:
all
This clue is a double definition.
'everything' is the first definition.
(all things)
'everyone' is the second definition.
(all people)
(Other definitions for all that I've seen before include "and 16 Across and 23 Across: Even so" , "Everything or everyone" , "Quite" , "and 18: 'Sing through -- --' (carol)" , "The works" .)