>>137
English is unclear on this point. For example, "an English student" could mean "a student of English" or "a student from England." But usually, when we say "an English teacher," we mean "a teacher of English" (someone who teaches English).

Sometimes word stress shows you the difference when spoken aloud:
"An ENGLISH teacher" = someone who teaches English.
"An English TEACHER" = a teacher who is from England.