50 across position place (9) letters _ I _ a _ d _ o _
89a not listened to (7) letters _ n _ e _ _ _
98a quite likely to be voted in (9) letters e _ e _ t _ b _ e
100a semi-circular object (4 & 4) h _ l _ _ _ 0 _
90down jogged the memory of (8) _ _ h _ n _ e _