Sailor's musical box? (5)
I believe the answer is:
ditty
This might be a double definition.
'sailor's musical' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'box?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
Can you help me to learn more?
(Other definitions for ditty that I've seen before include "Short simple song" , "Air" , "Little tune" , "Simple tune" , "Light-hearted song" .)