What does the cryptic crossword clue "This vegetable supplies make-up material, mostly wild (8)" mean?

The wordplay uses a charade (building blocks). KOHL (synonym="‘make-up material’") + RABI (synonym="RABI") = KOHLRABI The answer is KOHLRABI.

This vegetable supplies make-up material, mostly wild (8)

Guardian Cryptic #29574 | 5 Down | 2024-12-24 flower