Crossword Genius

As said by dad to a hothead? (3)

Ross

I believe the answer is:

pah

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'as said by dad to a hothead?' is the definition.
I can't tell whether this definition defines the answer.

'by dad to a hothead?' is the wordplay.
'by' is a charade indicator (letters next to each other).
'dad' becomes 'pa' ('pa' can be a synonym of 'dad').
'to a hothead?' becomes 'h' (head letter of 'hot').
'pa'+'h' is 'PAH'.

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.
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