Concession press opposed in part (3)
I believe the answer is:
sop
'concession' is the definition.
(sop is a kind of concession)
'press opposed in part' is the wordplay.
'in part' indicates the answer is hidden within the clue.
'SOP' is hidden in the letters of 'press opposed'.
(Other definitions for sop that I've seen before include "A concession or bribe, once offered to Cerberus" , "Appeasing gift" , "Something of no great value given to appease" , "Propitiatory offering" , "Appeasing bribe" .)