Answer:

tailer

Answer	Crossword Clue
TAILER	Detective's role at times
TAILER	Carrier in a thresher.
TAILER	Detective.

TAILER	Private eye, when he shadows.
TAILER	Sleuth.
TAILER	Follower.
TAILER	Tec, at times
TAILER	Private eye, at times
TAILER	P.I., at times

Crossword

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