What does the cryptic crossword clue "Auction includes hard rock (5)" mean?

The definition is "rock". The wordplay uses charade, container. SALE (synonym of "Auction") + H (synonym of "hard") [container: "includes"]; definition: "rock" The answer is SHALE.

Auction includes hard rock (5)

Guardian Cryptic #29399 | 5 Down | 2024-06-03 flower

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