Gestured about design (6)
I believe the answer is:
signed
'gestured' is the definition.
(signing is a kind of gesturing)
'about design' is the wordplay.
'about' indicates an anagram.
'design' with letters rearranged gives 'SIGNED'.
(Other definitions for signed that I've seen before include "Autographed" , "Subscribed" , "Inscribed - endorsed" , "Put one's name to" , "Authorised (in writing)" .)