Possible Clues:

• Dessert's earlier temperature has become cold; this upset could throw plans into confusion
• Place trap carelessly and this could be upset
• One not to upset?
• Don't upset this old man, returning with outline record for retirement
• This being upset throws plans into disarray
• Place trap to upset this!
• Metaphorical victim of an upset
• Spoil carefully laid plans - upset the . . . . . . . . .
• 'It may be so upsetting to make a mess of the fruit (5,4)'
• Shaw got a priest with the cartel confused - so upsetting!