21A SWEETEN hid-agrammed in "PeoplE WE SENT" def. pacify (I can't see what else it could be given the crossing letters and the restrictions of this puzzle)
26A LEST Def. "in case" hid-agrammed in "chatTELS" (poss. the trickiest in the grid)
20D ASSAIL in "AustrALIA'S Show" Def. "hit"