Company dutiful for rich (7)
I believe the answer is:
copious
'rich' is the definition.
('copious' can be a synonym of 'rich')
'company dutiful' is the wordplay.
'company' becomes 'co' (abbreviation).
'dutiful' becomes 'pious' (I've seen this before).
'co'+'pious'='COPIOUS'
'for' is the link.
(Other definitions for copious that I've seen before include "Abundant in supply" , "Large in number or quantity" , "Plentiful, existing in large amounts" , "good measure" , "Redundant" .)