An Arapaho expression of contempt (3)

I believe the answer is:

pah

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

'expression of contempt' is the definition.
'pah' can be an answer for 'expression' (I have seen 'Expression of disgust' mean 'pah' so perhaps 'expression' could also mean 'pah'). I am unsure of the 'of contempt' bit.

'an arapaho' is the wordplay.
'PAH' is hidden in amongst the letters.
However, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Another definition for pah that I've seen is " Expression of disgust".)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app