A colour in the Company’s statements of belief (6)
I believe the answer is:
credos
'statements of belief' is the definition.
(I've seen this in another clue)
'a colour in the company's' is the wordplay.
'a colour' becomes 'red' (red is a kind of colour).
'in the' means one lot of letters goes inside another.
'company's' becomes 'co's' (abbreviation).
'red' placed within 'cos' is 'CREDOS'.
(Other definitions for credos that I've seen before include "Scored with tenets" , "Sections of masses" , "Scored with beliefs or principles" , "Musical movements" .)