The term 'Master Hand' can be broken down into three crossword solutions: EXPERT (6 letters), MAVEN (5 letters), and PRO (3 letters). An EXPERT is someone who has a high degree of skill or knowledge in a particular field. A MAVEN is an individual who is experienced and knowledgeable in a particular area, often to the point of being an authority. A PRO is someone who is highly skilled at a particular activity or profession. All three terms can be used to describe someone who is an EXPERT in their field and is highly proficient in their craft.