Skim off grease from

• Prepare, as skim milk
• Skim milk?
• Remove the adipose part
• Make leaner, as meat
• Prepare chicken, in a way
• Get the grease out of
• Skim, as soup
• Skim off grease
• Trim, as a T-bone

Wiktionary Word definitions in Wiktionary
vb. To remove fat from a material, especially by the use of solvents