As a print reproduced on one side (8)
I believe the answer is:
partisan
'on one side' is the definition.
(as opposed to bipartisan)
'as a print reproduced' is the wordplay.
'reproduced' indicates anagramming the letters (I've seen 'reproduce' mean this).
'as'+'a'+'print'='asaprint'
'asaprint' anagrammed gives 'PARTISAN'.
(Other definitions for partisan that I've seen before include "Prejudiced towards one cause" , "Arts pain (anag.)" , "Prejudiced towards a particular cause" , "Guerrilla" , "Prejudiced in favour of a particular cause" .)