Fervent enthusiasm (7)
(Other definitions for zeal that I've seen before include "Fanaticism" , "Prompt willingness" , "Passion" , "Laze around with enthusiasm" , "Laze about with energy" .)
(Other definitions for passion that I've seen before include "fire" , "Fervent love" , "Intense enthusiasm for something" , "Ardour, fervour" , "Ardent emotion" .)