Company distributed a lot of steak ribs (6)

'ribs' is the definition.
('costa' can be a synonym of 'rib')

'company distributed a lot of steak' is the wordplay.
'company' becomes 'co' (abbreviation).
'distributed' is an anagram indicator.
'a lot of' means to remove the last letter (most of the word but not all of it).
'steak' with its last letter taken away is 'stea'.
'stea' with letters rearranged gives 'stae'.
'co'+'stae'='COSTAE'