Got stuck on a few that cannot be looked up on google.
25a) Grimace on pull grotesque faces (4) G??N
9a) Slang term for large and satisfying meals (4-3) N?S? -?P?
26a) Oily secretion that acts as lubricant for hair & skin (5) ?E?U?
29d) Any of a group of lustrious rockforming minerals used as dielectrics(in heating elements etc)
Very many thanks for your help