Old South American soup found here? (5)
I believe the answer is:
incan
This clue could be a double definition.
'old south american' is the first definition.
(I've seen this before)
'soup found here?' is the second definition.
The definition suggests a singular noun which matches the answer.
(Other definitions for incan that I've seen before include "Member of old Andean civilisation" , "Old Peruvian" , "like former Peruvian empire" , "Of an ancient civilisation" , "Like some South Americans" .)