The most common and most likely answer to this crossword clue is the 11 letter word CHANDELIERS
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Buddy explains!

The straight part
We know that "light fixtures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case light fixtures = chandeliers.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 CHANDELIERS mean?
CHANDELIERS noun- A branched, often ornate, lighting fixture suspended from the ceiling
- (auction) A fictional bidder used to increase the price at an auction.
- A portable frame used to support temporary wooden fences.
- An endoilluminator used in eye surgery.