Possible Clues:

• Daughter is to rest following sickness
• See 25
• Sidney comes back with comfort? Well, that's not it
• Is this what one needs comething 2 down for? Well, it's not (7)
• Sickness in seaside resort
• See 27
• Unusual seaside shingles for instance
• Polluted seaside leads to complaint
• Seaside accommodation giving rise to complaint
• Sickness comes when the waters subside all round