What does the cryptic crossword clue "Fish, ridiculous in a dress! (8)" mean?

The definition is "Fish,". The wordplay uses an anagram. anagram of IN + A + DRESS! = SARDINES; definition: "Fish," The answer is Sardines.

Fish, ridiculous in a dress! (8)

Telegraph Prize Cryptic #3022 | 5 Down | 2019-09-22 flower