The most common and most likely answer to this crossword clue is the 6 letter word IBISES
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The straight part
We know that "Waders" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case waders = ibises.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 IBISES mean?
IBISES noun- Any of various long-legged wading birds in the family Threskiornithidae, having long downcurved bills used to probe the mud for prey such as crustaceans.