Possible Clues:

• Confess to disheartened gaffer, being mature
• Fully-developed opponents entering ring
• Mature Republican wearing academic dress at university
• No little N,W, or G?
• Fully-developed
• It's gross to confess one's over the hill
• Mature bunch seizing victory when one short
• Mature women heartlessly held by band
• Mature audience's response to pun — cheered
• Mature wine every now and then drunk by family