The most common and most likely answer to this crossword clue is the 6 letter word RADIUS
R
A
D
I
U
S
More clues leading to the result RADIUS
- Artist - I'd backed American line
- Broadcaster cut unserviceable operating area
- Leaders of research and development include Underground scheme for Circle line
- Spoke of resistance using Saudi mobile
- Straight line that runs from elbow to wrist
- Bone‘s diameter to be halved
- US raid ‘compromised’ — that’s the line coming from centre
- Raid botched over American range of operation
- Part of an opera that can be used to define a 9 Ac.
- Spoke of Darius’ organisation
Buddy explains!

The straight part
We know that "line" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case line = radius.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 RADIUS mean?
RADIUS noun- The long bone in the forearm, on the side of the thumb.
- The lighter bone (or fused portion of bone) in the forelimb of an animal.
- One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.
- A line segment between any point of a circle or sphere and its center.
- The length of this line segment.
- Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.