Cryptic crossword clue
Vehicle carrying old map on the same flat surface 8

The most common and most likely answer to this crossword clue is the 8 letter word COPLANAR

I've seen this crossword clue in The Times
C
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Buddy explains!

The straight part
We know that "on the same flat surface" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case on the same flat surface = coplanar.
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.

Crossword Answer definitions

COPLANAR adjective
  1. (of at least two things, usually lines or plane figures) Within the same plane.
  2. (of multiple planets or other orbiting bodies) Orbiting a central celestial object within the same orbital plane.

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