Crossword Genius

Announcing retrospective - assign it a glum or pessimistic segment (12)

Ross

I believe the answer is:

promulgating

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

'announcing' is the definition.
(promulgating is a kind of announcing)

'retrospective assign it a glum or pessimistic segment' is the wordplay.
'PROMULGATING' is hidden back-to-front in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

I've seen this clue in The Guardian.
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