Possible Clues:

• Ending for "poly"
• Compound that's an anagram of "steer"
• Triglyceride, for one
• She's terrified —this chemical has been swallowed
• Husbandless woman radical
• No A in 11 across makes the matter chemical for the sound of her
• Certain organic compound
• Compound comprises terraced houses
• ''Steer'' anagram
• Organic compound obtained from a variety of trees