Don't understand when a sentence ends with a ”と”。。。

I think someting in the following sentence is unsaid after the と、but no idea what it could be.

Sentence is: 朝まで もう一稼ぎしないと

Comes from a line out of Midnight Diner, Tokyo Stories. Two ladies are dining next to each other at a restaurant counter (they don't know each other) and the one lady asks the other if she is done working for the night (she just learned that she is a taxi driver) and then the taxi driver lady replies with: 朝まで もう一稼ぎしないと.

Anyone with a clue? よろしくお願い！

Yeah, the grammar form is ない＋と trailing at the end of the sentence.  What isn't said is いけない.

So it becomes ない+と+いけない.

This is the same grammar construct as the なければならない form (I must do).

So what the taxi driver lady is saying is "I have to work until morning".

ない+と is pretty common in casual speech, so it's a good one to remember!