With this you can get a handle on your gambling (3-5,6)
I believe the answer is:
one-armed bandit
'with this you can get a handle on your gambling' is the definition.
The definition suggests a singular noun which matches the answer.
'with this you can get a' is the wordplay.
I cannot really see how this works, but
'with' could be 'and' (I've seen this before) and 'and' is found within the answer.
'you' could be 'one' (I've seen this before) and 'one' is found within the answer.
'a' is found in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for one-armed bandit that I've seen before include "Bend" , "Gambling machine" .)