Possible Clues:

• Pigment made from clay and iron oxide
• Impatient expression from Jock about money
• Christ briefly implicated in opposite sides for 25
• Odd chore for one of those in 17 down
• Natural earth shade
• Heart moved to take top job and get gold
• Pigment runs into line that shouldn't be crossed
• In the firing line, Rex Brown, rather yellow
• Mineral pigment; chore (anag.)
• Brass work that's tedious moving over to first place