What does the cryptic crossword clue "Sack of iron concealing iridium (4)" mean?

The definition is "Sack". The wordplay uses a container (one word inside another). IR (synonym="=iridium, i.e. chemical formula") in FE (synonym="=iron, i.e. chemical formula") = FIRE; definition: "Sack" The answer is FIRE.

Sack of iron concealing iridium (4)

Independent Cryptic #11653 | 19 Across | 2024-02-15 flower

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