The clarinet is held in a manner that it leans on the thumb of the right hand with a metal hook, which is located on the lower joint, (one-third from the top of the thumb is the best position). The next three fingers curve gently around the clarinet to cover three holes, while the little finger presses keys 2, 4, 1a and 3a as needed (see the picture on the left). The thumb of the left hand covers the only hole on the back of the upper clarinet joint as well as duodecim or registry key (12). See the same picture – upper left, in the corner.
Next three fingers curve gently around the clarinet to cover three holes, while the little finger presses keys 1, 3 and 2a (see the picture below left). The clarinet fingering is shown on the site Clarinet Fingering Chart.
Fingers should be raised only to the extent necessary not to disturb
The clarinet should be held at an angle of 40 ° relative to the body. Elbows are slightly spread away from the chest in order to allow us free and easy breathing.
When playing, the shoulders should not be raised because the clarinetist might come in spasm. The shoulders should have a natural position. The picture on the right illustrates the position described.
Taken from my book