Company with time to employ a workforce is heaven (9)
I believe the answer is:
firmament
'is heaven' is the definition.
(I've seen this before)
'company with time to employ a workforce' is the wordplay.
'company' becomes 'firm' (I've seen this before**).
'with' means one lot of letters go next to another.
'time' becomes 't'.
'to employ' means one lot of letters goes inside another.
'workforce' becomes 'men'.
'firm'+'t'='firmt'
'a'+'men'='amen'
'firmt' enclosing 'amen' is 'FIRMAMENT'.
(Other definitions for firmament that I've seen before include "Sky (literary)" , "The celestial sphere" , "outer space, encapsulated" , "Heavens, sky" , "The starry heaven" .)