Reclassifies missing series describing something that may be taxing (6)
I believe the answer is:
fiscal
'taxing' is the definition.
Although both the answer and definition are adjectives, I don't understand how they can define each other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fiscal that I've seen before include "Relating to state revenue" , "Relating to tax" , "Relating to taxes" , "In respect of tax revenues" , "Relating to the public revenue" .)