Line taken from popular culture (3)
I believe the answer is:
arc
'line' is the definition.
(arc is a kind of line)
'taken from popular culture' is the wordplay.
'taken from' says the answer is hidden in the clue.
'ARC' can be found hidden inside 'popular culture'.
(Other definitions for arc that I've seen before include "A curve for Joan of . . ." , "cut off from the circle" , "circle? Not entirely" , "Segment of circle" , "Curved path" .)