Crossword Genius

Singer's money runs out (4)

Ross

I believe the answer is:

bass

'singer's' is the definition.
(bass is a kind of singer)

I cannot understand how the rest of the clue works.

(Other definitions for bass that I've seen before include "Fish for the low-voiced" , "Fish; male singing voice" , "Fish; deep voice" , "Scottish rock" , "Fish (which sings?)" .)

I've seen this clue in The Times.
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