Related Clues:

• Subtly nasty
• DNA part
• Acetic __
• Left-handed
• Nasty, as remarks
• Litmus reddener
• Lysergic, for one
• Alkali counterpart
• Users drop it
• The 'A' in DNA
• Derogatory, as a remark
• Far from polite
• Heartburn cause
• Base antagonist?
• Beyond sarcastic