Answer: leading

AnswerCrossword Clue
LEADINGPrincipal.
LEADINGAhead.
LEADINGOn top.
LEADINGLike some lights
LEADINGKind of question
LEADINGIn the van
LEADINGAhead
LEADINGFirst part of journey interrupted by a racket (7)
leadingMost important
leadinga covering of lead