Possible Clues:

• Outside it's barren, inside it's cold, bitter
• Too pungent
• Tart runs into a group of detectives
• Pungent or sharp, like smoke
• Tart and redhead embraced by tart
• Bitter start to a cry from the heart
• Like horseradish
• Bitter and cold -- dry outside
• Drug resistance is involved in biting
• Tart's free on account