23a an object that recalls a certain place, occasion or person (8) ??U?E?I? and
24a brittle savoury biscuits in the shape of knots or sticks (8) ?R?T?E??...
22a A common point or boundary between two things, subject etc (9) ?N?E?F?C? ... and 36d a warning or hint, especially given confidentially (3,3) T?? O?F