Company with million quid making chemicals (9)
I believe the answer is:
compounds
'chemicals' is the definition.
'company with million quid' is the wordplay.
'company' becomes 'co' (abbreviation).
'with' is a charade indicator (letters next to each other).
'million' becomes 'm' (abbreviation).
'quid' becomes 'pounds' (I can't justify this - if you can you should give a lot more credence to this answer).
'co'+'m'+'pounds'='COMPOUNDS'
'making' is the link.
Can you help me to learn more?
(Other definitions for compounds that I've seen before include "Mixtures of chemical elements" , "settles a debt" , "Chemical unions of two or more elements" , "Enclosures of residences and other buildings" , "Wholes formed from two or more parts" .)