The most common and most likely answer to this crossword clue is the 8 letter word SNEAKERS
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Buddy explains!

The straight part
We know that "footwear" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case footwear = sneakers.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 SNEAKERS mean?
SNEAKERS noun- One who sneaks.
- An athletic shoe with a soft, rubber sole.
- A vessel of drink.
- A sneaker male.