Work attitude creates hostility (10)
I believe the answer is:
opposition
'hostility' is the definition.
(thesaurus)
'work attitude' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'attitude' becomes 'position' (position is a kind of attitude**).
'op'+'position'='OPPOSITION'
'creates' acts as a link.
(Other definitions for opposition that I've seen before include "antagonism" , "parliamentary group" , "Resistance, dissent" , "those out of power" , "Political party" .)