Translation:The girl waits under the clock to which that boy is hurrying.
Shouldn't "Az alatt az óra alatt vár a lány, amelyikhez az a fiú siet" be "The girl waits under THAT clock, to which that boy hurries"? (I've reported it.)
The "az alatt" part of "az alatt az óra alatt" is "THAT", as I understand it. "Under THE clock" would simply be "Az óra alatt vár a lány ...", right?
That is one way, or you can simply just drop the comma from the English sentence to match it to the Hungarian meaning. Thereby the second clause would automatically become an identifying one, instead of just being a piece of extra information.
"The girl waits under the clock to which that boy is hurrying."
"The girl waits under the clock which that boy is hurrying to."
Unfortunately, this is still a wide-spread problem throughout the course, as of the writing of this comment. The Hungarian sentence requires the comma, the English sentence should NOT have a comma, in most of these cases in this course.