The most common and most likely answer to this crossword clue is the 5 plus 4 plus 1 plus 4 letter word DRINK LIKE A FISH
I've seen this crossword clue in Independent
D
R
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N
K
L
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K
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A
F
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H
More clues leading to the result DRINK LIKE A FISH
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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.