Raised bet wins nothing when century scored (3,2)
I believe the answer is:
ton up
'century scored' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'raised bet wins nothing' is the wordplay.
'raised' says the letters should be written backwards (going up in a down clue).
'bet' becomes 'punt' (punting is a kind of betting).
'wins' indicates putting letters inside.
'nothing' becomes 'O' (O resembles 0).
'punt' enclosing 'o' is 'punot'.
'punot' written backwards gives 'TON-UP'.
'when' is the link.
Can you help me to learn more?
(Other definitions for ton up that I've seen before include "Achieving a nice round figure" , "A fair old speed" , "So is fast rider" , "speed merchant" , "100 mph" .)