OK, apparently cricket ground welcomes runs (8)
I believe the answer is:
approval
'ok' is the definition.
(getting the OK is getting approval)
'apparently cricket ground welcomes runs' is the wordplay.
'apparently' becomes 'app' (I've seen this in other clues).
'cricket ground' becomes 'oval' (London cricket ground).
'welcomes' means one lot of letters goes inside another (in sense of 'invites in').
'runs' becomes 'r' (cricket abbreviation).
'app'+'oval'='appoval'
'appoval' enclosing 'r' is 'APPROVAL'.
(Other definitions for approval that I've seen before include "Leave" , "On it, goods may be returned if not satisfactory" , "Acceptance as satisfactory" , "Ratification" , "Official consent, authorisation" .)