Check the chorus (7)
I believe the answer is:
refrain
I believe this clue is a double definition.
'check' is the first definition.
(thesaurus)
'chorus' is the second definition.
(I know that chorus can be written as refrain)
'the' acts as a link.
(Other definitions for refrain that I've seen before include "Musical phrase" , "Do without" , "Words repeated after verses" , "Kindly desist - from song?" , "Main theme" .)