Ordinary company working to acquire millions (6)
I believe the answer is:
common
'ordinary' is the definition.
(synonyms)
'company working to acquire millions' is the wordplay.
'company' becomes 'co' (abbreviation).
'working' becomes 'on' (on can mean working or activated).
'to acquire' is an insertion indicator.
'millions' becomes 'mm' (an abbreviation for millions written twice).
'co'+'on'='coon'
'coon' going around 'mm' is 'COMMON'.
(Other definitions for common that I've seen before include "Open land; not rare" , "Vulgar or frequent" , "Ordinary piece of land" , "Ill-bred sort of open grassland?" , "Banal" .)