What does the cryptic crossword clue "Case that QC and JP are in, but not barristers (5)" mean?

The definition is "Case that QC and JP are in, but not barristers". The wordplay uses a cryptic definition. Cryptic definition The answer is UPPER.

Case that QC and JP are in, but not barristers (5)

Times Cryptic #28628 | 4 Down | 2023-06-13 flower