Antagonism in work place (10)
I believe the answer is:
opposition
'antagonism' is the definition.
(thesaurus)
'work place' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'place' becomes 'position' ('position' can be a synonym of 'place'**).
'op'+'position'='OPPOSITION'
'in' acts as a link.
(Other definitions for opposition that I've seen before include "Rivalry" , "Resistance, dissent" , "those out of power" , "organized political group" , "Enemy" .)