Nicodemus's birds can't fly (4)

I believe the answer is:

emus

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

'birds can't fly' is the definition.
I can't judge whether this defines the answer.

'nicodemus's' is the wordplay.
'EMUS' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for emus that I've seen before include "Running birds" , "Muse about flightless Australian birds" , "laboratory units" , "Largest native Australian birds" , "Fast, but not high-fliers" .)

I've seen this clue in the Evening Standard.

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