What does the cryptic crossword clue "Fish eating seaweed that's hypothetically perfect? (5,3)" mean?

The definition is "that’s hypothetically perfect?". The wordplay uses a container (one word inside another). ALGA (synonym="ALGA") in IDES (synonym="IDES") = IDEAL GAS; definition: "that's hypothetically perfect?" The answer is IDEAL GAS.

Fish eating seaweed that's hypothetically perfect? (5,3)

Times Cryptic #29141 | 7 Down | 2025-01-31 flower

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