Answer:

think

Answer	Crossword Clue
THINK	Exercise one's gray matter
THINK	Famous IBM office sign
THINK	"C'mon, Aimee, ...! There's gotta be a good clue out there for this word ..."

THINK	Be reasonable?
THINK	Use your head
THINK	Rack one's brains
THINK	"Try to remember!"
THINK	Reason
THINK	Type of tank
THINK	Tank type
THINK	"Use your head!"

THINK	Cogitate
THINK	End of the observation
THINK	Put your mind to work
THINK	Aptly named Final Jeopardy! theme song
THINK	END OF QUOTE
THINK	Use one's noodle
THINK	Dream (up)
THINK	Deliberate

THINK	Ponder
THINK	Use your brain
THINK	Believe.
THINK	Good motto for everyone.
THINK	Sign on an office wall.
THINK	Motto for the office wall.
THINK	Sign in an office.
THINK	Office wall sign.

THINK	Excogitate.
THINK	Ironic twist to a one-word maxim.
THINK	Office sign.
THINK	... twice (reconsider).
THINK	Cerebrate.
THINK	Popular office sign
THINK	Use gray matter
THINK	Cerebrate

THINK	Office-wall sign
THINK	Corporate motto
THINK	Kind of tank
THINK	Muse
THINK	Ideate