Cassandra gone trick-or-treating holding little monster (8)
I believe the answer is:
dragonet
'little monster' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'cassandra gone trick-or-treating' is the wordplay.
'DRAGONET' is hidden in amongst the letters.
But, I am not sure how this is indicated.
'holding' is the link.
Can you help me to learn more?
(Other definitions for dragonet that I've seen before include "spiny fish" , "Brightly coloured fish" .)