The most common and most likely answer to this crossword clue is the 9 letter word SHACKLING
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More clues leading to the result SHACKLING
Buddy explains!

The straight part
We know that "Restraining" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case restraining = shackling.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 SHACKLING mean?
SHACKLING verb- To restrain using shackles; to place in shackles.
- (by extension) To render immobile or incapable; to inhibit the progress or abilities of.
- To shake, rattle.