Speech-making in lab extension? (7)
I believe the answer is:
oratory
'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" .)