専
セン, もっぱ.ら

specialty, exclusive, mainly, solely

JLPT2 G6 S9 F506

叀# is a depiction of a heavy, round stone tied to and hanging from a spindle by a cord that rotates → round/rotating object. 專 adds 寸 hand/action indicator → handle a round, rotating object → *exclusive*; *dedicated* (← handle a single object) → *monopolize*.

[Full Kanji Etymology List]