What does the cryptic crossword clue "Superiority in mother dear’s stifling? (7)" mean?

The wordplay uses a container (one word inside another). MA (synonym="mother") in PRICY (synonym="dear") = PRIMACY The answer is PRIMACY.

Superiority in mother dear’s stifling? (7)

Guardian Cryptic #29593 | 17 Across | 2025-01-16 flower