The most common and most likely answer to this crossword clue is the 9 letter word ISOMETRIC
I
S
O
M
E
T
R
I
C
More clues leading to the result ISOMETRIC
- Eroticism somehow of equal measure?
- Woven in coir, items of equal size
- Kind of graph line displaying eroticism
- Liberated eroticism in the same form
- Somewhat wearisome trick-or-treaters of similar dimensions
- Eroticism may provide such exercise
- One certain knack that’s reduced kind of exercise
- Form of eroticism in exercising muscles
- Erotic maiden is artfully showing type of exercise
Buddy explains!

The straight part
We know that "Kind of graph line" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case kind of graph line = isometric.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 ISOMETRIC mean?
ISOMETRIC noun- A line connecting isometric points.
- Of, or exhibiting equality in dimensions.
- Of, or being a geometric system of three equal axes lying at right angles to each other (especially in crystallography).
- Of or involving muscular contraction against resistance in which the length of the muscle remains the same. See also: Wikipedia:isometric exercise
- (of a thermodynamic process) Taking place at constant volume because of being confined by rigid boundaries.