Answer:

jammer

Answer	Crossword Clue
JAMMER	Roller derby scorer
JAMMER	Jazzman, at times
JAMMER	Jazz musician, at times

JAMMER	Wind follower
JAMMER	Transmission blocker
JAMMER	Garbler of radio programs.
JAMMER	Wind follower?

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.