The most common and most likely answer to this crossword clue is the 6 letter word GANTRY
I've seen this crossword clue in Independent
G
A
N
T
R
Y
More clues leading to the result GANTRY
- Good attempt to incorporate a new framework
- Little Morgan trying to get support
- Good worker on railway platform
- Worry about test for supporting metal framework
- Feeling of anxiety upset attempt to produce bridgelike structure
- Derrickās supporter mounting horse, on the go!
- Support attempt to back horse to come first
- Worker in Greek yard getting platform
- Worry over model railway framework
- Large framework horse hauled up with effort
Buddy explains!

The straight part
We know that "supporting metal framework" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case supporting metal framework = gantry.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 GANTRY mean?
GANTRY noun- A framework of steel bars resting on side supports to bridge over or around something.
- A supporting framework for a barrel.
- A gantry crane or gantry scaffold.
- (medical imaging) A cylindrical scanner assembly in the bore of which the response of bodies or tissues to some specific exposure can be detected for 3D imaging.