Monster interrupting progress (4)

I believe the answer is:

ogre

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'monster' is the definition.
(synonyms)

'interrupting progress' is the wordplay.
'OGRE' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ogre that I've seen before include "Terrifying person" , "Man-eating monster of fairy tales" , "Fairy tale giant" , "Fierce giant" , "Bogeyman" .)

I've seen this clue in The Guardian.

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