What does the cryptic crossword clue "Fish left in hat (7)" mean?

The definition is "hat". The wordplay uses a charade (building blocks). L (synonym of "left") + BOATER (synonym of "hat"); definition: "Fish" The answer is BLOATER.

Fish left in hat (7)

Guardian Cryptic #25986 | 16 Down | 2013-06-28 flower

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