What does the cryptic crossword clue "Embassy staff proclaim CID post should be renewed (10,5)" mean?

The wordplay uses an anagram. anagram of PROCLAIM + CID + POST = DIPLOMATICCORPS The answer is DIPLOMATICCORPS.

Embassy staff proclaim CID post should be renewed (10,5)

Daily Mail Cryptic #16390 | 6 Down | 2020-08-27 flower