To gamble is best without a bit of risk! (3)
I believe the answer is:
bet
'to gamble' is the definition.
(betting is a kind of gambling)
'is best without a bit of risk' is the wordplay.
I cannot quite understand how this works, but
'is' could be 'be' and 'be' is found within the answer.
A single letter 't' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bet that I've seen before include "Wager, gamble" , "Money risked on a gamble" , "Speculation" , "22 across will accept one" , "Wager, back" .)