Mini burger (6)
I believe the answer is:
slider
'mini burger' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for slider that I've seen before include "American snack" , "Eg, fader control" , "Control such as on a mixing desk" , "Sir led (anag) - control mechanism" , "Control knob move up and down or sideways" .)