Simple computer language (5)
I believe the answer is:
basic
This clue is a double definition.
'simple' is the first definition.
(I know that simple can be written as basic)
'computer language' is the second definition.
(I've seen this in another clue)
(Other definitions for basic that I've seen before include "Plain" , "Staple; ordinary" , "Fundamental, forming a starting point" , "Fundamental, forming a starting-point" , "At the lowest level" .)