The most common and most likely answer to this crossword clue is the 4 letter word ECHT
E
C
H
T
More clues leading to the result ECHT
- Authentic quartet to be seen in Liechtenstein
- Authentic German 19th century bags returned
- Genuine Caravaggio’s first shown in the retrospective
- Genuine German dramatist, not British
- German playwright has British cast to be authentic
- Genuine cases of economic hindsight
- Genuine horror at the start when entering shock therapy
- Genuine article returned broken by Charlie
- Authentic German dramatist affected by Brexit?
- Real origins of European common toad probed by Henry
Buddy explains!

The straight part
We know that "authentic to Merkel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case authentic to merkel = echt.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 ECHT mean?
ECHT adjective- Proper, real, genuine, true to type