The most common and most likely answer to this crossword clue is the 8 letter word CURTAILS
I've seen this crossword clue in Financial Times
C
U
R
T
A
I
L
S
More clues leading to the result CURTAILS
Buddy explains!

The straight part
We know that "Restricts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case restricts = curtails.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 CURTAILS mean?
CURTAILS noun- A scroll termination, as of a step, etc.
- To cut short the tail of an animal
- To shorten or abridge the duration of something; to truncate.
- To limit or restrict, keep in check.