The most common and most likely answer to this crossword clue is the 6 letter word FAECES
I've seen this crossword clue in The Guardian
F
A
E
C
E
S
Buddy explains!
The straight part
We know that "droppings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case droppings = faeces.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 FAECES mean?
FAECES noun- Digested waste material (typically solid or semi-solid) discharged from the bowels; excrement.