Cryptic crossword clue
Doctor is one in suit I love to register with first 12

The most common and most likely answer to this crossword clue is the 12 letter word CARDIOLOGIST

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Buddy explains!

The straight part
We know that "Doctor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case doctor = cardiologist.
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 CARDIOLOGIST mean?

CARDIOLOGIST noun
  1. A physician who specializes in medical problems related to the heart.

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