Cryptic crossword clue
‘Wrack’ is Emerson, Lake and Palmer touching rock bottom 4

The most common and most likely answer to this crossword clue is the 4 letter word KELP

I've seen this crossword clue in The Daily Telegraph
K
E
L
P

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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 KELP mean?

KELP noun
  1. Any of several large brown seaweeds (order Laminariales).
  2. The calcined ashes of seaweed, formerly used in glass and iodine manufacture.

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