The most common and most likely answer to this crossword clue is the 8 letter word MOBILITY
I've seen this crossword clue in The Daily Telegraph
M
O
B
I
L
I
T
Y
More clues leading to the result MOBILITY
Buddy explains!
The straight part
We know that "The capacity to move" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the capacity to move = mobility.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 MOBILITY mean?
MOBILITY noun- The ability to move; capacity for movement.
- A tendency to sudden change; mutability, changeableness.
- The ability of a military unit to move or be transported to a new position.
- The degree to which particles of a liquid or gas are in movement.
- People's ability to move between different social levels or professional occupations.