Crossword Genius

Query order to appear for examination (4,4,8)

Ross

I think it could be either:

stem cell research

call into question

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

'examination' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

'query order to appear' is the wordplay.
I cannot really see how this works, but
'query' could be 'question' (synonyms) and 'question' is present in the answer.
'order' could be 'call' (calling is a kind of ordering) and 'call' is located in the answer.
'to' is within the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'for' is the link.

Can you help me to learn more?

I've seen this clue in The Times.
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