Drone like bishop with twice the energy (3)
I believe the answer is:
bee
'drone' is the definition.
(I've seen this in another clue)
'bishop with twice the energy' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'with' is a charade indicator (letters next to each other).
'twice' shows that letters should be duplicated.
'the energy' becomes 'e' (physics symbol as in E=mc2).
'e' doubled is 'ee'.
'b'+'ee'='BEE'
'like' acts as a link.
(Other definitions for bee that I've seen before include "In one's bonnet, it's an obsessive idea" , "Busy buzzer" , "Honey generator" , "A honey-maker" , "Flying insect (often busy)" .)