Clefs is a 5 letter English word. It's valid Scrabble word worth 9 points. It's valid Words with friends word worth 11 points.
You can make 49 anagrams from letters in clefs (cefls).
1570-80; Middle French Latin clāvis key
It will be noted that in each case the line on which the clef is placed represents "middle C."
He also observes that this oratorio is the first work in which the proper sharps and flats are generally placed at the clef.
In olden days any clef line might be taken with any number of lines above and below.
She was so tall the girls always considered her in that clef.
After a change of clef in the middle of a score this is, of course, not necessary.
The clef is here changed to its lowest, and the little book is a lot of tremolos about old age, death, and faith.
They could only be written (as they are yet) in one clef—namely, the F clef.
Le Tarot Divinatoire: clef du tirage des cartes et des sorts.
This was what has since become the fourth line, the clef line, of the bass stave.
clef, klef, n. a musical character placed on the staff by which the absolute pitch of the notes is fixed.