What does the cryptic crossword clue "Sage fact, yes, about things to protect car occupants (6,5)" mean?

The wordplay uses an anagram. anagram of SAGE + FACT, + YES, = SAFETYCAGES The answer is SAFETYCAGES.

Sage fact, yes, about things to protect car occupants (6,5)

Daily Mail Cryptic #17474 | 29 Across | 2024-10-24 flower