Crossword Genius

Aghast! Call two educational elements on condition die is cast (9)

Ross

I believe the answer is:

horrified

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

'aghast' is the definition.
(I know that aghast can be written as horrified)

'call two educational elements on condition die is cast' is the wordplay.
I cannot quite see how this works, but
'call' could be 'ho' (historical exclamation used to attract attention) and 'ho' is located in the answer.
'condition' could be 'if' (I've seen this in other clues) and 'if' is found within the answer.
an anagram of 'die' is 'ied' which is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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