Currently active, reviewed in one to ten games (7)
I believe the answer is:
magneto
'currently active' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'reviewed in one to ten games' is the wordplay.
'reviewed' says the letters should be written backwards.
'in' indicates a hidden word.
'otengam' can be found hidden inside 'to ten games'.
'otengam' backwards is 'MAGNETO'.
Can you help me to learn more?
(Other definitions for magneto that I've seen before include "kindles a spark" , "car component" , "Small electric generator" , "generation device" , "Ignition apparatus" .)