Cryptic crossword clue
Protect small moorland plant river washed away 7

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

I've seen this crossword clue in Independent
S
H
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A
T
H
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Buddy explains!

The straight part
We know that "Protect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case protect = sheathe.
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 SHEATHE mean?

SHEATHE verb
  1. To put (something such as a knife or sword) into a sheath.
  2. To encase (something) with a protective covering.
  3. Of an animal: to draw back or retract (a body part) into the body, such as claws into a paw.
  4. To thrust (a sharp object like a sword, a claw, or a tusk) into something.
  5. To abandon or cease (animosity, etc.)
  6. To provide (a sword, etc.) with a sheath.
  7. To relieve the harsh or painful effect of (a drug, a poison, etc.).

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