Crossword Puzzle Sensible cipher?

Clue: Sensible cipher?

'The Clue in the Crossword Cipher' solver (NANCYDREW with 9 letters)
Give someone the skills to do a simple cipher? (SUBSTITUTETEACH with 15 letters)
Convert into cipher (ENCODE with 6 letters)
U.S. code and cipher grp. (NSA with 3 letters)
What eight squares in this puzzle contain, thus creating a cipher key (TWOLETTERS with 10 letters)
Construct a cipher (ENCODE with 6 letters)
Cipher org. (NSA with 3 letters)
Not in cipher (UNENCODED with 9 letters)
Cipher (e.g. CODE with 4 letters)
In cipher (ENCODED with 7 letters)