Expression of faith that the company is out of the red! (5)
I believe the answer is:
credo
'expression of faith' is the definition.
'credo' can be an answer for 'faith' (I've seen this before). I am unsure of the 'expression of' bit.
'the company is out of the red' is the wordplay.
'the company' becomes 'co' (abbreviation).
'is out of' means one lot of letters goes inside another (some letters on the outside of others).
'co' placed around 'red' is 'CREDO'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for credo that I've seen before include "Formal statement of belief" , "conviction" , "Part of the service" , "System of principles" , "Words to live by; belief" .)