Cryptic crossword clue
Silicones used in plotting lines in a map, perhaps 9

The most common and most likely answer to this crossword clue is the 9 letter word ISOCLINES

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Buddy explains!

The straight part
We know that "lines in a map, perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lines in a map, perhaps = isoclines.
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 ISOCLINES mean?

ISOCLINES noun
  1. A tightly folded syncline or anticline in which the two sides are almost parallel
  2. Any of a series of lines having the same slope
  3. A line on a map linking places with the same magnetic dip

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