Possible Clues:

• Touchy subject
• Sensitive topic
• The "there" in "Don't go there"
• Subject worth avoiding
• Sensitive subject
• It's upsetting when crown's love is rejected?
• The 'there' in 'Don't go there'
• Subject that's best avoided
• Touchy subject: bruise, perhaps
• The "it" in "I don't want to talk about it"