What does the cryptic crossword clue "Rely on family for supply of claret? (5,4)" mean?

The wordplay uses a charade (building blocks). BLOOD (synonym="family") + BANK (synonym="rely") = BLOODBANK The answer is BLOODBANK.

Rely on family for supply of claret? (5,4)

Guardian Cryptic #29273 | 25 Across | 2024-01-08 flower