Okay last two, and too tired tonight. 17D and 18D (I've been useless at this corner this week) 17D With reckless determination (4-4) ZEAL-?E?T and 18D Old word for a toll-road (8) L??N?I?E
No first word definitely begins with Z Zulu fits in a gap that would otherwise be ?u?u. And as the rest of the word is ze?l I figured it would be zeal. Thanks though.