Times Jumbo Crossword 1099

[Donaldinho]

14a Trio - T?r??????
3d A native of the Americas - A???I??
6d Early aid to multiplication - N???e?? ?o?s
28d Group of stas in Taurus - ?l?i?d?s
25d Poisonous compound in green potatoes - S?l?n?n?
55a Highest point - ?e?t?s

[MargoTester]

14a threesome
3d Amerindian
6d napiers rod
25d sola nine
55a vertex
28d pleiAdes

[puzzlerlen]

postclassical napiers rods solanine could be answers to 15a 6d & 25d

[puzzlerlen]

Possible answers could be:
14a Threesome
3d Amerind
6d Napiers Rods
28d Pleiades
25d Solanine
55a Vertex
hope these are of help. Puzzlerlen

[gvick]

14a Trio - T?r?????? THREESOME
3d A native of the Americas - A???I?? AMERIND
6d Early aid to multiplication - N???e?? ?o?s NAPIERS RODS
28d Group of stas in Taurus - ?l?i?d?s PLEIDES
25d Poisonous compound in green potatoes - S?l?n?n? SOLENIN
55a Highest point - ?e?t?s VERTEX