The most common and most likely answer to this crossword clue is the 7 letter word OCCULTS
I've seen this crossword clue in The Guardian
O
C
C
U
L
T
S
More clues leading to the result OCCULTS
Buddy explains!

The straight part
We know that "eclipses" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case eclipses = occults.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 OCCULTS mean?
OCCULTS verb- To cover or hide from view.
- To dissimulate, conceal, or obfuscate.