Answer: plumber

AnswerCrossword Clue
plumbervertically
plumbercompletely
plumberperpendicular
plumberone who installs or repairs plumbing
plumberperson who installs and repairs plumbing
plumberto test by a plumb line
plumberexactly
plumberto examine closely
plumbersmall weight suspended by a line (plumb line) and used to measure depth or to ascertain a vertical line
PLUMBER... in "The Adventure of Charles Augustus Milverton" ...
PLUMBERLeak fixer
PLUMBERPipe repairman
PLUMBERHe manipulates snakes
PLUMBERDurkin was one.
PLUMBERPipe pro
PLUMBEROne who might advise you that a flush beats a full house?
PLUMBERWatergate conspirator, slangily