Cryptic crossword clue
One of algae group that invades mid-sea environs 6

The most common and most likely answer to this crossword clue is the 6 letter word DESMID

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The straight part
We know that "One of algae group" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one of algae group = desmid.
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 DESMID mean?

DESMID noun
  1. Any of about 5000 species of mostly unicellular freshwater green algae belonging to the order Desmidiales.

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