Opening for Surrey, vital to get on this? (10)
I believe the answer is:
Here is my best explanation:
'this?' is the definition.
The definition suggests a singular noun which matches the answer.
'opening for surrey vital to get on' is the subsidiary indication.
'opening for' says to take the initial letters.
'vital' becomes 'core'.
'to get on' becomes 'board' ('board' can be a synonym of 'get on').
The initial letter of 'surrey' is 's'.
(Other definitions for scoreboard that I've seen before include "On which points are tallied", "It shows state of game", "Where match results are displayed" and "Indicator of the state of play".)