On the face of it, success is targeted in the fewest possible turns (6,4)
I believe the answer is:
rubiks cube
'on the face of it success' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'is targeted in the fewest possible turns' is the wordplay.
I cannot really understand how this works, but
'is' could be 'be' and 'be' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for rubiks cube that I've seen is " 3-D combination puzzle invented in 1974".)