Unspecific specifier rejected if specific (7)
I believe the answer is:
precise
'specific' is the definition.
(associated in meaning)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for precise that I've seen before include "Specific" , "Express" , "Detailed, exact" , "Highly accurate and sharply exact" , "Recipes (anag.)" .)