Violinist is a clerk, maintains days and dates (7)
I believe the answer is:
fiddler
'violinist' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fiddler that I've seen before include "A person playing violin" , "Famous musical '. . . . . . . on the Roof'" , "Violinist (on the 11?)" , "Great musical ''....... on the roof''" , "Violinist (informal)" .)