Crossword Genius

The threepenny musical? (4,1,8)

Ross

I believe the answer is:

half a sixpence

I'm a little stuck... Click here to teach me more about this clue!

'musical?' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for half a sixpence that I've seen before include "Musical" , "3d" .)

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