Sanction to fail to get up? (8)
I believe the answer is:
notarise
'sanction' is the definition.
('sanction'->'notarize' is in my internal thesaurus and 'ize'->'ise')
'fail to get up?' is the wordplay.
'fail' becomes 'not' (I can't justify this - if you can you should give a lot more credence to this answer).
'to get up?' becomes 'arise' ('arise' can be a synonym of 'get up').
'not'+'arise'='NOTARISE'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for notarise that I've seen before include "Officially attest" , "Authenticate" , "Certify (document) officially" , "Establish truth" , "establish an official record" .)