Opening for Surrey, vital to get on this? (10)
I believe the answer is:
scoreboard
'this?' is the definition.
The definition suggests a singular noun which matches the answer.
'opening for surrey vital to get on' is the wordplay.
'opening for' suggests taking the first letters.
'vital' becomes 'core'.
'to get on' becomes 'board' ('board' can be a synonym of 'get on').
The first letter of 'surrey' is 's'.
's'+'core'+'board'='SCOREBOARD'
(Other definitions for scoreboard that I've seen before include "It shows state of game" , "Where match results are displayed" , "Indicator of the state of play" , "It has information about the competition" , "It should feature up-to-date numbers" .)