Answer: affix

AnswerCrossword Clue
AFFIX

Append, as a signature

AFFIX

Paste or staple

AFFIX

Attach, as a sticker

AFFIX
Attach, as postage
AFFIX
Add at the beginning or end
AFFIXFasten (to)
AFFIXTack on
AFFIXFasten; attach
AFFIXSubjoin
AFFIXFasten.
AFFIXSubjoin.
AFFIXAdd
AFFIXBolt
AFFIXFasten
AFFIXGlue on, maybe
AFFIXAttach firmly
AFFIXAttach securely
AFFIXGlue on
AFFIXPaste on, as a stamp
AFFIXStick on
AFFIXAppend
AFFIXPaste on
AFFIXAttach
AFFIXPin
AFFIXStaple or paste