Related Clues:

• Agent for many a trip
• Sneering
• Carbolic ___
• Compound with a low pH
• Full of sarcasm
• Hydrochloric --
• Substance with a low pH
• Beginning to a bad rain?
• Insinuatingly derogatory
• Spiteful, as a remark
• Caustic, as words
• Kind of rock or jazz
• Battery content
• Low-pH compound
• Test or rock lead-in