The most common and most likely answer to this crossword clue is the 14 letter word DERMATOLOGISTS
I've seen this crossword clue in Financial Times
D
E
R
M
A
T
O
L
O
G
I
S
T
S
Buddy explains!
The straight part
We know that "Medical specialists" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case medical specialists = dermatologists.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 DERMATOLOGISTS mean?
DERMATOLOGISTS noun- A person who is skilled in, professes or practices dermatology.