High-level computer programming language for beginners that first appeared in 1964 (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
basic
(Other definitions for basic that I've seen before include "Fundamental -- early computer language" , "Rudimentary - programming language" , "Fundamental, forming a starting point" , "Fundamental or rudimentary" , "Fundamental, underlying" .)