not have a clue meaning in English

不懂, 一无所知

You may not have a clue how it works
您不可以有线索怎么这有效。
That was something had been going on for years on the other side of the world , which we did not have a clue
原来在世界的另一端?一直存在著我们没有办法去明白跟想像的生活环境。
I entered seminary with this predicament not having a clue as to whether or not i would ever break through this terror that gripped me whenever i had to speak in front of people
我就是这样子进入神学院，我完全没有头绪，不知道有没有能力突破这恐惧，克服在人们前说话的恐惧。