The most common and most likely answer to this crossword clue is the 9 letter word HARNESSED
H
A
R
N
E
S
S
E
D
More clues leading to the result HARNESSED
Buddy explains!
The straight part
We know that "Controllable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case controllable = harnessed.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 HARNESSED mean?
HARNESSED verb- To place a harness on something; to tie up or restrain.
- To capture, control or put to use.
- To equip with armour.