The most common and most likely answer to this crossword clue is the 6 letter word HAWKER
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More clues leading to the result HAWKER
Buddy explains!

The straight part
We know that "Salesman, one clearing throat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case salesman, one clearing throat = hawker.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does HAWKER mean?
HAWKER noun- A peddler, huckster, who travels about to sell easily transportable goods.
- Any dragonfly of the family Aeshnidae; a darner.
- Someone who breeds and trains hawks and other falcons; a falconer.