Number promoter is staying in (3,3)
I believe the answer is:
not out
'staying in' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'number promoter' is the wordplay.
'number' becomes 'no.' (abbreviation).
'promoter' becomes 'tout' (I am not sure about this - if you are sure you should believe this answer much more).
'no'+'tout'='NOT-OUT'
'is' is the link.
Can you help me to learn more?
(Other definitions for not out that I've seen before include "Refusal of an appeal?" , "Decision in batsman's favour" , "Decision favourable to batsman" .)