The most common and most likely answer to this crossword clue is the 8 letter word POLARITY
I've seen this crossword clue in The Times
P
O
L
A
R
I
T
Y
More clues leading to the result POLARITY
Buddy explains!
The straight part
We know that "opposition" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case opposition = polarity.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 POLARITY mean?
POLARITY noun- The state of being a north pole or south pole; the magnetic equivalent of electric charge
- The separation, alignment or orientation of something into two opposed poles.
- Either of the two extremes of such attributes.
- The dipole-dipole intermolecular forces between the slightly positively-charged end of one molecule to the negative end of another or the same molecule. Wp
- The division of an embryo into an animal pole and a vegetal pole within a blastula. Wp
- Spatial differences in shape, structure, and function within a cell. Wp
- A measure of the electrical potential at the ends of a circuit. Wp
- The direction of a wave's amplitude or its being in phase or antiphase.
- (grammar) The grammatical category of the affirmative and the negative. Wp
- A duality that is an involution, i.e. has order two. Wp
- An indicator of the positivity or negativity of a literal. Wp
- Any of the various ways in which power is distributed within the international system. Wp
- (gender) The concept of dualism between masculine and feminine. Wp
- A correspondence between the points in the plane of a triangle not lying on the sides of the triangle and lines in the plane of the triangle not passing through the vertices of the triangle.