Sly
Wit
A three letter word for cleverness and intelligence is wit.
Wit or apt means cleverness or intelligent.
wit
A three letter word that could mean clever is sly.
bad
Fib or a false.
Wit is a three-letter word that refers to both a sense of humor and cleverness.
Earnest.
If it's three letters, it's "hug". If it's four letters, it's "kiss".
Depends on what sets means. If it is pairs of letters then it is bookkeeper
Gathering intelligence, interpreting intelligence, and advising their principals.
COMINT, ELINT, and FISINT