The most common and most likely answer to this crossword clue is the 6 letter word MODULE
M
O
D
U
L
E
More clues leading to the result MODULE
- Working method required to cover large part of course
- Drug smuggler smuggles too many drugs in self-contained unit
- Course of foreign shellfish including squid’s tail
- Stubborn chap keeps turning up to fix unit
- Brief course in fashion with extremely useful content
- 11 spy sheltering from the French
- Mike replaces the gas in a mineral lump to make a modern 9 Ac. structure
- Computer component's circuit pulled up after the couple hacks through a tree to retreat
- Moulded model contains uniform segment
- The game’s up in Middle East unit
Buddy explains!

The straight part
We know that "a modern 9 Ac. structure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a modern 9 ac. structure = module.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 MODULE mean?
MODULE noun- A self-contained component of a system, often interchangeable, which has a well-defined interface to the other components.
- A standard unit of measure used for determining the proportions of a building.
- A section of a program; a subroutine or group of subroutines.
- A unit of education covering a single topic.
- A pre-prepared adventure scenario with related materials for a role-playing game.
- An abelian group equipped with the operation of multiplication by an element of a ring (or another of certain algebraic objects), representing a generalisation of the concept of vector space with scalar multiplication.
- (fractal geometry) A fractal element.
- A file containing a music sequence that can be played in a tracker (called also mod or music module).
- (hydraulics) A contrivance for regulating the supply of water from an irrigation channel.
- An independent self-contained unit of a spacecraft.