Herb beginning to speak, interrupting conference (7)
I believe the answer is:
parsley
'herb' is the definition.
(I know that parsley is a type of herb)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for parsley that I've seen before include "Green plant" , "Use the herb sparely" , "Herbal garnish" , "Herb (flat-leafed or curly)" , "plant used in cooking" .)