What does the cryptic crossword clue "Fishy piece from Schubert? (4)" mean?

The wordplay uses a hidden word. Hidden answer (piece from) in sCHUBert. Had it been a 5-letter answer, it might have been TROUT… The answer is CHUB.

Fishy piece from Schubert? (4)

Independent Cryptic #12022 | 6 Across | 2025-04-21 flower