Blow into hole in burner (3,4)
I believe the answer is:
gas lamp
'burner' is the definition.
(something which burns gas)
'blow into hole' is the wordplay.
'blow' becomes 'slam' (both can mean a hit).
'into' is an insertion indicator.
'hole' becomes 'gap'.
'slam' inserted within 'gap' is 'GAS-LAMP'.
'in' acts as a link.
(Other definitions for gas lamp that I've seen before include "may be illuminating" , "Form of illumination" , "Bright object" , "Burning source of light" , "Sort of light" .)