The most common and most likely answer to this crossword clue is the 10 letter word DOWNSWINGS
I've seen this crossword clue in The Guardian
D
O
W
N
S
W
I
N
G
S
Buddy explains!

The straight part
We know that "drops" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drops = downswings.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 DOWNSWINGS mean?
DOWNSWINGS noun- The portion of any movement along an arc or curve, heading in a lower direction.