What does the cryptic crossword clue "Supply post providing grub (11)" mean?

The definition is "grub". The wordplay uses a charade (building blocks). CATER (synonym of "Supply") + PILLAR (synonym of "post"); definition: "grub" The answer is CATERPILLAR.

Supply post providing grub (11)

Guardian Cryptic #27448 | 18 Across | 2018-03-05 flower

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