The "clip" (properly a "Charger") does not go into the rifle at all.
The Charger sits in the Charger Guide on the rifle and the rounds are stripped FROM the Charger, into the Magazine of the rifle.
Best way to strip the rounds into the Mag is with your thumb right up against the Charger itself, NOT partway down the length of the cartridge. One fast swipe down, and she's loaded. You don't have to remove the Charger: just snap the Bolt forward and the Charger will remove itself. (You the pick the Charger up because they are getting scarce and expensive!).
Some Chrgers, especially the late Parkerised ones, can be most finicky about letting the rounds strip out. These ones you either get rid of, or polish the edges of the INSIDE of the Charger lips with a piece of Crocus cloth.
Correct way to load the Charger is the same as for the Lee-Enfield: DUDUD, meaning "down-up-down-up-down". In a picture, that would be _-_-_.
Have fun!