Answer:

let

Answer	Crossword Clue
LET	Allow
LET	Court call
LET	Hire out

LET	Lease
LET	Pig tail?
LET	Rented
LET	The Beatles' ".... It Be"
LET	Wimbledon call
LET	.. down (disappoint)
LET	Tennis do-over
LET	Tennis term

LET	Wimbledon do-over
LET	Leased
LET	Permit
LET	Tennis call
LET	The Beatles' ".. It Be"
LET	Voided tennis play
LET	Rent out
LET	Give permission to

LET	Net ball
LET	Voided serve
LET	Court do-over
LET	Replayed point
LET	Suffer
LET	Tennis replay
LET	Net-nicking serve
LET	Serve that doesn't count

LET	Say it's OK
LET	Say it's okay
LET	Do-over serve
LET	Enable
LET	Hindrance
LET	Diminutive suffix
LET	Take lodgings
LET	Dropped service?

LET	Charter
LET	Sanction
LET	Allow to
LET	Permit to
LET	"... a hundred flowers bloom...": Mao Zedong