Crossword Genius

Crack base on the gramophone? (4)

Ross

I believe the answer is:

flaw

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

'crack' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for flaw that I've seen before include "Mark, blemish" , "Weakness" , "weak spot" , "(Make) defect(ive)" , "failing" .)

I've seen this clue in the Sydney Morning Herald.
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