Remarkable people elevated plant and brand making brown sauce (9)
I believe the answer is:
phenomena
'remarkable people' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for phenomena that I've seen before include "Happenings" , "strange doings!" , "They happen" , "spectacles" , "Observable events" .)