Maybe Danish dad's on trial (6)
I believe the answer is:
pastry
'maybe danish' is the definition.
(I know that Danish is a type of pastry)
'dad's on trial' is the wordplay.
'dad's' becomes 'pa's' (pa can mean someone's father).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'trial' becomes 'try'.
'pas'+'try'='PASTRY'
(Other definitions for pastry that I've seen before include "Eg, pie crust" , "Pie base" , "Dough of flour, water and shortening" , "Cake - tart" , "Choux --; puff --" .)