Possible Clues:

• Four or six in test? It's of little significance
• With Pursuit, Haney and Abbott invention
• Not important to have a little bottle of this at last
• Worthless setter's endlessly in trouble
• Fellow's area of expertise is New Zealand writer
• Not being the first of 8 down, there's only four in 6 down
• Unimportant, minor
• How four matters little in the court case
• Minor getting only six in a test
• Quite unimportant and paltry