Possible Clues:

• Do too well
• No longer interested in explorer's burn, perhaps
• Make dry, as salmon
• Do too much in Ulster, say — it's fine for a time
• Make mushy, as pasta
• Romantic partner hasn't got a starter - one of those in the kitchen put it in the oven for too long
• Leave for a long time in the oven to burn head off crust for chef
• Approval for a time in warm clothing to burn?
• Do too much about one refusing to fight sanction