An indexable turning insert includes two opposing larges sides formed by a support center part and a plurality of cutting parts projecting outwardly therefrom, each having a cutting edge extending between the sides and being spaced apart around the outer perimeter of the center part for indexing, has four the cutting parts. Each cutting part has a clearance side extending on one of the sides of the insert from the cutting edge of the cutting part towards the center part while making clearance angles in two dimensions with respect to the cutting edge, and the cutting edge of each cutting part makes an angle being below 90° by less than the clearance angles with the other of the sides of the insert.