What does the cryptic crossword clue "Salt in plain shellfish (8)" mean?

The definition is "Salt". The wordplay uses a container (one word inside another). NACL (synonym="NaCl, chemical formula for common salt") in BARE (synonym="plain") = BARNACLE The answer is BARNACLE.

Salt in plain shellfish (8)

Guardian Cryptic #29134 | 17 Down | 2023-07-28 flower

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