Like a test of morality? (4)

I believe the answer is:

oral

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'like a test' is the definition.
I can't judge whether this definition defines the answer.

'of morality?' is the wordplay.
'of' says the answer is hidden in the clue.
'ORAL' is hidden within 'morality'.

Can you help me to learn more?

(Other definitions for oral that I've seen before include "Verbal" , "language exam" , "Via the mouth" , "By word of mouth, say exam" , "Spoken rather than written" .)

I've seen this clue in the Evening Standard.

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