Wild animal beheaded? One is charged (3)
I believe the answer is:
ion
'one is charged' is the definition.
(I've seen this in other clues)
'wild animal beheaded?' is the wordplay.
'wild animal' becomes 'lion'.
'beheaded?' means to remove the first letter.
'lion' with its first letter taken off is 'ION'.
(Other definitions for ion that I've seen before include "Eletrically charged particle" , "Electrically-charged particle" , "Electrically charged atom or group of atoms" , "Electrically charged particle" , "Charged atom/molecule" .)