Answer:

will

Answer	Crossword Clue
WILL	Passing concern
WILL	What indicates everything that's left?
WILL	Plans to

WILL	Source of some power?
WILL	It may be good or free
WILL	See 85-Down
WILL	Not just might
WILL	Heir lines?
WILL	Mental power
WILL	It may be free for philosophers
WILL	Something read in many a murder mystery

WILL	It details what's left
WILL	Self-control
WILL	Something left behind
WILL	Desire