The term 'PRECURSOR OF BAKER AND CHARLIE' can be solved by the word 'ABLE', which is a four-letter word. ABLE is an adjective that means having the power, skill, means, or opportunity to do something. It is often used to describe someone who is capable of doing something. In this context, it could refer to someone who was the predecessor of Baker and Charlie, meaning they had the skills and abilities to do the job before them.