The most common and most likely answer to this crossword clue is the 7 letter word SPAMMER
S
P
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M
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The straight part
We know that "Junk trader" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case junk trader = spammer.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 SPAMMER mean?
SPAMMER noun- Someone who sends spam.
- A spring-loaded mechanical hammer specially adapted to be used in microgravity.