Enter a clue or pattern or both:
The Clue
Agree in writing (4 letter answer)
The Answer
SIGN
Tags
Notes
The answer SIGN is seen frequently, appearing about once every 130 puzzles.
Related Clues
Autograph
Billboard
Endorse
"The ___ of the Four"
Index
Indication
Indicator
Ink
Leo, for one
Manifestation
Omen
Portent
Shingle
S.R.O. ___
Subscribe
Token
Trace
Vestige
Accept a contract
Affix an autograph
Catcher's flash
Catcher's gesture
Coach's communication
Communicate by hand
Communicate silently
Emulate Gwinnett
"The ___ of Four": Doyle
Ink a contract
Nod, e.g.
Speak with the hands
Speak manually
Zodiac unit
Coach-to-batter gesture
Convey via Ameslan
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Make legally effective
Not just initial
Pickup line request
Plus or minus, say
Use the dotted line
Affix one's John Hancock
Crop circle, some believe
Stop or Do Not Pass