Basic telly never thrown out (5-5)
I believe the answer is:
entry-level
'basic' is the definition.
(eg an entry-level job)
'telly never thrown out' is the wordplay.
'thrown out' indicates an anagram.
'telly'+'never'='tellynever'
'tellynever' with letters rearranged gives 'ENTRY-LEVEL'.
(Other definitions for entry-level that I've seen before include "Suitable for beginners" , "Simple enough for a beginner" .)