What does the cryptic crossword clue "Rib functions lessened (5)" mean?

The definition is "Rib". The wordplay uses a charade (building blocks). COS (synonym="abbreviation for cosine") + TA (synonym="anatomical term for a rib bone") = COSTA; definition: "Rib" The answer is COSTA.

Rib functions lessened (5)

Independent Cryptic #12078 | 26 Across | 2025-06-25 flower

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