Disappointment caused by moist firework? (4,5)
I believe the answer is:
damp squib
'disappointment caused' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'by moist firework?' is the wordplay.
'by' is a charade indicator (letters next to each other).
'moist' becomes 'damp' (synonyms).
'firework?' becomes 'squib' (squib is a kind of firework).
'damp' next to 'squib' is 'DAMP SQUIB'.
Can you help me to learn more?
(Other definitions for damp squib that I've seen before include "Unsuccessful attempt to impress - firework won't ignite?" , "Firework that doesn't" , "set up by a guy?" , "Unsuccessful attempt to impress, like moist firework" , "Something unsuccessful" .)