The most common and most likely answer to this crossword clue is the 5 letter word FUNKY
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More clues leading to the result FUNKY
Buddy explains!

The straight part
We know that "fashionable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fashionable = funky.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 FUNKY mean?
FUNKY adjective- Offbeat, unconventional or eccentric.
- Not quite right; of questionable quality; not appropriate to the context.
- Cool; great; excellent.
- Having or relating to the smell of funk.
- Relating to or reminiscent of various genres of African American music, especially funk.
- Relating to, or characterized by, great fear, or funking.