Musical crab? (7)
I believe the answer is:
fiddler
This clue might be a double definition.
'musical' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'crab?' is the second definition.
(fiddler crab is a kind of crab)
Can you help me to learn more?
(Other definitions for fiddler that I've seen before include "A person playing violin" , "Violinist (on the 11?)" , "Popular musical '. . . . . . . on the Roof'" , "Type of crab; one on the Roof" , "Violinist - cheat" .)