Cryptic crossword clue
Convincing oneself car has motion 14

The most common and most likely answer to this crossword clue is the 14 letter word AUTOSUGGESTION

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

The straight part
We know that "Convincing oneself" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case convincing oneself = autosuggestion.
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 AUTOSUGGESTION mean?

AUTOSUGGESTION noun
  1. The practice of suggesting thoughts to oneself, as in autohypnosis.
  2. An instance of suggesting a thought to oneself.
  3. An autosuggest feature.

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