To endorse, not to stand (8)
I believe the answer is:
notarise
'to endorse' is the definition.
('endorse'->'notarize' is in my internal thesaurus and 'ize'->'ise')
'not to stand' is the wordplay.
'to stand' becomes 'arise' (I've seen this before).
'not'+'arise'='NOTARISE'
(Other definitions for notarise that I've seen before include "establish an official record" , "Officially attest" , "Establish truth" , "Witness official documents" , "Certify (document) officially" .)