Used an unspoken language (6)
I believe the answer is:
signed
(Other definitions for signed that I've seen before include "Gestured with meaning" , "Wrote one's name" , "Inscribed - endorsed" , "Subscribed" , "Authorised (in writing)" .)
I believe the answer is:
signed
(Other definitions for signed that I've seen before include "Gestured with meaning" , "Wrote one's name" , "Inscribed - endorsed" , "Subscribed" , "Authorised (in writing)" .)