What does the cryptic crossword clue "Cascara part-exchanged in South American city (7)" mean?

The definition is "city". The wordplay uses an anagram. anagram of CASCARA = CARACAS; definition: "South American city" The answer is CARACAS.

Cascara part-exchanged in South American city (7)

Guardian Cryptic #29104 | 1 Across | 2023-06-23 flower