Cryptic crossword clue
  American investigator on mobile for one doing wet work? 7

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

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "one doing wet work?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one doing wet work? = frogman.
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 FROGMAN mean?

FROGMAN noun
  1. A diver, especially one in a diving suit (as opposed to one in scuba gear).
  2. A military diver, e.g. a US Navy SEAL.

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