Dog that's handy in a laser presentation (7)
I believe the answer is:
pointer
This clue is a double definition.
'dog' is the first definition.
(I know that pointer is a type of gun dog)
'that's handy in a laser presentation' is the second definition.
(as in a laser pointer)
(Other definitions for pointer that I've seen before include "Sign" , "under control of mouse" , "Indicator" , "Guide" , "Signpost - dog" .)