Is this your crossword clue?
"fiend" is also used as a crossword clue. If that's what you saw, the answer is often devil (5 letters).
Definitions
an evil supernatural being
Word origin
From Middle English fend, feend (“enemy; demon”), from Old English fēond (“enemy”), Proto-West Germanic *fijand, from Proto-Germanic *fijandz.
Used in a sentence
“what God or Feend, or ſpirit of the earth, Or Monſter turned to a manly ſhape, Or of what mould or mettel he be made, […]”
“Many hold too that he was acquainted with forbidden arts, and used to carry on an intercourse with the fiends and old women that raised storms, and such like.”
“Be that word our sign of parting, bird or fiend!”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Devotee”5 letters
02“An evil supernatural being”5 letters
Not quite right?
"Search similar patterns."
F____