The most common and most likely answer to this crossword clue is the 6 letter word CAPPED
I've seen this crossword clue in The Times
C
A
P
P
E
D
Buddy explains!

The straight part
We know that "Wearing head coverings/restricted" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wearing head coverings/restricted = capped.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 CAPPED mean?
CAPPED verb- To cover or seal with a cap.
- To award a cap as a mark of distinction.
- To lie over or on top of something.
- To surpass or outdo.
- To set an upper limit on something.
- To make something even more wonderful at the end.
- To select a player to play for a specified side.
- To shoot (someone) with a firearm.
- To select to play for the national team.
- To salute by uncovering the head respectfully.
- To deprive of a cap.
- To tell a lie.
- To convert text to uppercase.
- To take a screenshot or to record a copy of a video.