Stuck on the last 5 viz 1 across Provoke offensive about Corbyn T???T (thought tempt or taunt but dont get the parsing) " down ...while entering Moscow's her aim primarily ??S?A (could have A or U to begin with) 8 down 1 of 3 amusing scapegoats making second a bit comical C?R?Y; 21 down Burns' lassie leaving Italy with Greek trio ?R???S and 26 across one who's take tea say hot and with crushed ice? - T?E??. I had thought thief but 15 down is DODONAEAN so that accounts for the third letter