Answer:

FAKEIT

Answer	Crossword Clue
FAKEIT	Ad lib, maybe
FAKEIT	Ad-lib
FAKEIT	Pretend

FAKEIT	Look like you know what you're doing
FAKEIT	Look relaxed when you're nervous, e.g.
FAKEIT	Put on an act
FAKEIT	Smile though your heart is aching, e.g.
FAKEIT	Improvise
FAKEIT	Put on a show
FAKEIT	Try to get by through bluffing
FAKEIT	Act like an expert without being one

FAKEIT	Bluff
FAKEIT	Bluff one's way through