The most common and most likely answer to this crossword clue is the 10 letter word OVERRIDING
I've seen this crossword clue in The Daily Telegraph
O
V
E
R
R
I
D
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G
More clues leading to the result OVERRIDING
Buddy explains!
The straight part
We know that "Dominant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dominant = overriding.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 OVERRIDING mean?
OVERRIDING verb- To ride across or beyond something.
- To ride a horse too hard.
- To counteract the normal operation of something; to countermand with orders of higher priority.
- To define a new behaviour of a method by creating the same method of the superclass with the same name and signature.
- The act or process by which something is overridden.
- Superior, of supreme importance in the case.