Possible Clues:

• How the hidden sun might help without a word spoken
• United Nations never speaks about aids
• To say nothing of a French port in Egypt
• Silent assistance by local individuals
• Perversely Sid and Una like Harpo's lines
• Happy, it would seem, to include one not mentioned
• Like something spoken with just a look
• Implicit, perhaps
• International organisation's help is implicit
• Part of India's nuclear rise not spoken about