“I’ll suss it out.”就是“我会把它弄清楚”

澳洲口语suss something out表示通过查看、询问或思考把情况弄清楚，并非“怀疑”。

A: Which form do we need for the booking?
B: I’m not sure. I’ll suss it out and get back to you.

这里是“我去查清楚再回复”。代词放中间：suss it out，不说suss out it。它也可用于了解一个人或判断选择，语气随意。英国英语也常见；正式邮件用I’ll check或I’ll investigate更清楚。

https://dictionary.cambridge.org/dictionary/english/suss-out
https://www.abc.net.au/listen/programs/brisbane-mornings/how-to-avoid-online-scams/13293788