In InDesign, graphics are placed within frames which can be used to crop. In Illustrator, graphics are just placed as is. To crop them, you have to draw the frame separately.
1: Place your graphic
2: Draw a shape over it, such as a rectangle, the size you want it cropped to.
3: Select both, then go to Object > Clipping Mask > Make.
The front shape will then mask the other graphic. It is possible to size the frame independantly from the graphic, although it's a little trickier than InDesign. Use the Direct Selection Tool (the white arrow) to select it on its own, then either move individual points, or switch to the Selection Tool (black arrow) to scale it.