Expression of contempt (3)

I think it could be either:

Which length description are you looking for?:

bah

'expression of contempt' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in The Guardian, The New York Times and the Evening Standard.

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