The most common and most likely answer to this crossword clue is the 11 letter word OVERBEARING
I've seen this crossword clue in The Daily Telegraph
O
V
E
R
B
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A
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I
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G
More clues leading to the result OVERBEARING
Buddy explains!
The straight part
We know that "Authoritarian" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case authoritarian = overbearing.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 OVERBEARING mean?
OVERBEARING verb- To carry over.
- To push through by physical weight or strength; to overwhelm, overcome.
- To prevail over; to dominate, overpower; to oppress.
- To produce an overabundance of fruit.
- Overly bossy, domineering, or arrogant.