Richer gambler right on track? (6,3)

I believe the answer is:

better-off

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'richer' is the definition.
(I've seen this before)

'gambler right on track?' is the wordplay.
'gambler' becomes 'better' (someone who makes bets is a gambler).
'right on track?' becomes 'off' (I can't justify this - if you can you should believe this answer much more).
'better'+'off'='BETTER-OFF'

Can you help me to learn more?

(Other definitions for better-off that I've seen before include "Richer" , "In a more financially secure position" .)

I've seen this clue in The Telegraph.

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