Lear’s beginning to enter stage and I’m keeping close to you – powerful stuff (9)
I believe the answer is:
plutonium
'close to you powerful stuff' is the definition.
I can't tell whether this defines the answer.
'lear's beginning to enter stage and i'm' is the wordplay.
'beginning to' suggests taking the first letters.
'enter' indicates putting letters inside.
'stage' becomes 'put on' (as in putting on a show).
'and' is a charade indicator (letters next to each other).
'i'm' becomes 'ium' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'lears' is 'l'.
'l' inserted within 'puton' is 'pluton'.
'pluton'+'ium'='PLUTONIUM'
'keeping' is the link.
Can you help me to learn more?
(Other definitions for plutonium that I've seen before include "Nuclear material" , "Radioactive element" , "Fuel for nuclear reactors" , "Radioactive material, Pu" , "sign of this bomb-making material" .)