Meaning of “clean” - Learner’s Dictionary

clean

adjective uk us /kliːn/
NOT DIRTY

A1 not dirty:

clean hands
clean clothes
You should try to keep the kitchen a bit cleaner.
NO SEX

not about sex:

a clean joke
NO CRIME

showing that you have not done anything illegal:

a clean driving licence
FAIR

fair and honest:

a clean election/fight

(Definition of “clean adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)