31a: Use it for protection when you sleep with relatives. 6 letters. n???i?
38a:Such a dessert looks like rubbish to the alien. 6 letters. ?u???t
39a: Game to encase a note in stone. 5 letters. r?g??
63a: Edge the fairy quietly to find her character. 9 letters. p?r?m?e?y
Thanks to all. Don’t think parameter will fit. Answer must end in y to tie in with 23 d answer which is saint Stephen’s day. Could it begin with peri ??? as word fairy in the clue ???