Company men bringing in a bit of trade for Sky (9)
I believe the answer is:
firmament
'sky' is the definition.
(the firmament means the sky)
'company men bringing in a bit of trade' is the wordplay.
'company' becomes 'firm' (firm can mean a company or business).
'men' becomes 'm' (abbreviation).
'bringing in' is an insertion indicator.
'bit of trade' becomes 'ent' (I can't justify this - if you can you should believe this answer much more).
'firm'+'m'='firmm'
'firmm' placed around 'a' is 'firmam'.
'firmam'+'ent'='FIRMAMENT'
'for' is the link.
Can you help me to learn more?
(Other definitions for firmament that I've seen before include "Heavens, sky" , "The starry heaven" , "outer space, encapsulated" , "Sky (literary)" , "The celestial sphere" .)