Answer: holdon

AnswerCrossword Clue
HOLDON

"Give me a sec"

HOLDON

"Not so fast!"

HOLDON

Be patient

HOLDON
Wait
HOLDON
Persist.
HOLDONPersevere.
HOLDONPhrase much used on the phone.
HOLDONStop!
HOLDONCling
HOLDONPersevere
HOLDONClutch tightly
HOLDONTelephone line?
HOLDON'Just a sec'
HOLDONHang in there
HOLDON"Just a sec"