Selection of swing-music is abruptly rejected as standard (5)
I believe the answer is:
basic
'standard' is the definition.
(similar in meaning)
'selection of swing-music is abruptly rejected' is the wordplay.
'selection of' says the answer is hidden in the clue.
'rejected' says the letters should be written backwards.
'cisab' can be found hidden inside 'swing music is abruptly'.
'cisab' written backwards gives 'BASIC'.
'as' acts as a link.
(Other definitions for basic that I've seen before include "Fundamental, forming a starting point" , "Fundamental, underlying" , "Simple - computer language" , "Fundamental, forming a starting-point" , "Elementary - without extras" .)