Cryptic crossword clue
Unscrupulous sort

The most common and most likely answer to this crossword clue is the 7 letter word SHYSTER

I've seen this crossword clue in Financial Times
S
H
Y
S
T
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R


Buddy explains!

The straight part
We know that "will be back shortly after retiring (7)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case will be back shortly after retiring (7) = shyster.
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 SHYSTER mean?

SHYSTER noun
  1. Someone who acts in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.
SHYSTER verb
  1. To act in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.
  2. To exploit (someone or something) in this way.

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