Free current still emptying into device (8)
I believe the answer is:
dislodge
'free' is the definition.
(I know that free can be written as dislodge)
'current still emptying into device' is the wordplay.
'current' becomes 'I' (symbol for electric current).
'emptying' suggests removing the centre.
'into' indicates putting letters inside.
'device' becomes 'dodge' (device can mean a trick or dodge).
'still' with its middle removed is 'sl'.
'i'+'sl'='isl'
'isl' going into 'dodge' is 'DISLODGE'.
(Other definitions for dislodge that I've seen before include "Prise out of position" , "Glided so as to move from established position" , "Remove from a fixed position" , "Knock from an established position" , "put out" .)