Sanction program run at London cricket ground (8)
I believe the answer is:
approval
'sanction' is the definition.
(I've seen this before)
'program run at london cricket ground' is the wordplay.
'program' becomes 'app' (type of computer program).
'run' becomes 'r' (cricket abbreviation).
'at' says to put letters next to each other.
'london cricket ground' becomes 'Oval' (the Oval is a cricket ground in London).
'app'+'r'+'oval'='APPROVAL'
(Other definitions for approval that I've seen before include "Official consent, authorisation" , "Confirmation" , "Blessing" , "Ratification" , "Commendation - on which to try things out" .)