What does the cryptic crossword clue "Cassandra gone trick-or-treating holding little monster (8)" mean?

The definition is "little monster". The wordplay uses a hidden word. Hidden (‘held by’) in CassanDRA GONE Trick-or-treating The answer is DRAGONET.

Cassandra gone trick-or-treating holding little monster (8)

Independent Cryptic #11952 | 5 Down | 2025-01-29 flower