Great orator might thus use letters B, D, E, I, N, and R (11)
I believe the answer is:
spellbinder
'great orator' is the definition.
'spellbinder' can be an answer for 'orator' (spellbinder is a kind of orator). I am not sure about the 'great' bit.
'thus use letters b d e i n and r' is the wordplay.
I cannot really see how this works, but
'b' is within the answer.
'd' is present in the answer.
'e' is present in the answer.
'i' is found in the answer.
'n' is within the answer.
'r' is within the answer.
This may be the basis of the clue (or it may be nonsense).
'might' is the link.
Can you help me to learn more?
(Other definitions for spellbinder that I've seen before include "A fascinating one" , "Enthralling speaker" , "Gifted orator" .)