What does the cryptic crossword clue "Fish represented in a harp (7)" mean?

The definition is "Fish". The wordplay uses an anagram. anagram of IN + A + HARP = PIRANHA; definition: "Fish" The answer is PIRANHA.

Fish represented in a harp (7)

Daily Mail Cryptic #17000 | 10 Across | 2022-12-29 flower