ei klokke · clock, watch
Feminine (ei)
Indefinite singular
ei klokke
Definite singular
klokka
Indefinite plural
klokker
Definite plural
klokkene
Feminine nouns (ei) can always be written with en as well: ei bok, boka or en bok, boken. Both are correct Bokmål.
How to guess the gender Nouns: gender and articles