Company surrounded by money (4)
I believe the answer is:
coin
'money' is the definition.
(coin is a type of money)
'company surrounded' is the wordplay.
'company' becomes 'co' (abbreviation).
'surrounded' becomes 'in' (I've seen this in other clues).
'co'+'in'='COIN'
'by' is the link.
(Other definitions for coin that I've seen before include "Metallic money" , "Create (phrase); metal token" , "American quarter, for example" , "Fabricate" , "Invent (a new word)" .)