Cryptic crossword clue
Smooth touch in case of serious pollutants 3,6

The most common and most likely answer to this crossword clue is the 3 plus 6 letter word OIL SLICKS

I've seen this crossword clue in The Daily Telegraph
O
I
L
S
L
I
C
K
S

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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.

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