Certified waste parts for old chemical company (8)
I believe the answer is:
official
'certified' is the definition.
(I've seen this before)
'waste parts for old chemical company' is the wordplay.
I cannot quite see how this works, but
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is found within the answer.
'chemical company' could be 'ici' (I've seen this in other clues) and 'ici' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for official that I've seen before include "One is in a position of authority" , "worthy of credibility" , "Functionary" , "Formally approved" , "Publicly maintained" .)