Dic: straight as meaning correct

• Be sure you have your facts straight.
• Let me get this straight, you didn't know they had your car.
• Thanks for setting me straight.
• Let's get things straight. I didn't lunch with her.
• I wanted to get the facts straight.
• Let me get this straight - Tom sold the car and gave you the money?
• Tell him to ask Ruth - she'll put him straight.

* * *

■ information that is straight is correct:

• (a) get something straight: △to correctly understand something. 
• (b) set/put someone straight or set/put the record straight: △to tell someone the true facts about a situation after they have been told something that is not true.

■ If you get something straight, you make sure that you understand it properly or that someone else does . (SPOKEN)

■

• (a) get sth straight: spoken. to understand the facts of a situation and be able to tell them correctly.
• (b) set/put sb straight: to make someone understand the true facts about a situation.

..... Macmillan, COBUILD, LDOCE