What predicts recurring feature of momentary phenomena? (4)

I believe the answer is:

omen

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'what predicts recurring feature' is the definition.
I can't tell whether this defines the answer.

'of momentary phenomena?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'OMEN' is hidden within 'momentary phenomena'.

Can you help me to learn more?

(Other definitions for omen that I've seen before include "Portent, prophetic sign" , "Sign of things to come" , "Sign of likely future event" , "Foreboding" , "Portent of things to come" .)

I've seen this clue in The Independent.

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