Well, one takes a risk (6)
I believe the answer is:
better
'well' is the definition.
(similar in meaning)
'one takes a risk' is the wordplay.
I cannot really see how this works, but
'one' could be 'er' (I've seen this in other clues) and 'er' is present in the answer.
'risk' could be 'bet' (I've seen this in another clue) and 'bet' is found in the answer.
A single letter 't' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for better that I've seen before include "no longer sick" , "Recovered; gambler" , "More effectively" , "Gambler; more effective" , "Improve upon" .)