Crossword Genius

An expression of contempt, we hear (3)

Ross

I believe the answer is:

bah

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'an expression of contempt' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for bah that I've seen before include "Exclamation of disgust or annoyance" , "Exclamation of contempt or disgust - Scrooge used to say it" , "Disbelieving expression" , "''...! Humbug!'' (Scrooge)" , "Comic expression of contempt" .)

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