The most common and most likely answer to this crossword clue is the 8 letter word DOGMATIC
D
O
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M
A
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C
More clues leading to the result DOGMATIC
- Highly principled old lady ambushed by cur and jerk
- I got mad working with college being overbearing
- Overbearing, uppity Lord and Master gets boundless criticism
- Assertive mother, under 25, reviewed detailed quote
- Arrogant to cheat chess expert at one chess opening
- Opinionated creature married a jerk
- Hound arts graduate that is cursed primarily with doctrinaire manner
- Opinionated setter, perhaps, starts to moan about themes in crosswords
- Follow matters primarily with a habitual response — being this?
- Opinionated beast — dull and in charge
Buddy explains!

The straight part
We know that "overbearing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overbearing = dogmatic.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 DOGMATIC mean?
DOGMATIC noun- One of an ancient sect of physicians who went by general principles; opposed to the empiric.
- Adhering only to principles which are true a priori, rather than truths based on evidence or deduction.
- Pertaining to dogmas; doctrinal.
- Asserting dogmas or beliefs in a superior or arrogant way; opinionated, dictatorial.