Sentence:  Everyone is ambivalent about his <WSD>profession</WSD> , if he has practised it long enough , but there were still moments when he loved the stage and all those unseen people out there , who might cheer you or boo you , but that was largely , though not entirely , up to you . 
Meaning of the word marked with <WSD> tags:  an occupation requiring special education (especially in the liberal arts or sciences)