The most common and most likely answer to this crossword clue is the 8 letter word SYMMETRY
S
Y
M
M
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T
R
Y
More clues leading to the result SYMMETRY
- Harmony of form, a sort of m-mystery!
- Strange mystery involving minute, pleasing form?
- Try me out with my singular correspondence!
- Solved mystery about opening of minister correspondence
- Mystery man begins to unravel correspondence
- Reflective nature of mystery plays with mass participation
- Correspondence reflecting awards for TV judge
- Extremely sexy Madame to aim for shapely attribute
- Strange mystery with Master put in proportion
- TV award’s put up with judge’s agreement
Buddy explains!

The straight part
We know that "Harmony of form" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case harmony of form = symmetry.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 SYMMETRY mean?
SYMMETRY noun- Exact correspondence on either side of a dividing line, plane, center or axis.
- The satisfying arrangement of a balanced distribution of the elements of a whole.