Crossword Genius

Speech-making in lab extension? (7)

Ross

I believe the answer is:

oratory

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'speech-making' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for oratory that I've seen before include "Art of public speaking or small chapel" , "Private chapel; art of public speaking" , "prayer room" , "School" , "formal speech" .)

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