Possible Clues:

• Where the best man slags off the groom, in a manner of speaking
• What a noun is (3 words)
• What the best man uses to slag off the groom, in a manner of speaking
• Not complete address for article, for instance
• An adjective maybe that could describe 'Ladies and gentlemen...'
• Type of word that contributes to an oration
• Summing up what's only the introduction
• Element of grammar found in extract from Hamlet's soliloquy, for example
• Summing up interjection
• Noun, verb or preposition, e.g. (3 words)