Unoriginal company with two or more colours (6)
I believe the answer is:
copied
'unoriginal' is the definition.
(similar in meaning)
'company with two or more colours' is the wordplay.
'company' becomes 'co' (abbreviation).
'with two or more colours' becomes 'pied-' (I've seen this before).
'co'+'pied'='COPIED'
(Other definitions for copied that I've seen before include "Imitated, reproduced" , "Imitated or replicated" , "most sincerely flattered" , "Reproduced (something)" , "Imitated or recreated" .)