Possible Clues:

• To say nothing of a French port in Egypt
• United Nations never speaks about aids
• How the hidden sun might help without a word spoken
• Kept inside
• Implied, perhaps
• Happy, it would seem, to include one not mentioned
• Goes without saying that the sun will get to help this
• International organisation's help is not pronounced
• The cat would come back with it, in a manner of speaking
• Not to speak of a 1 across