Slip it into the projector (5)
I believe the answer is:
slide
'projector' is the definition.
(slide projector is a kind of projector)
'slip it into' is the wordplay.
I cannot quite see how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found within the answer.
The remaining letters 'slid' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'the' is the link.
Can you help me to learn more?
(Other definitions for slide that I've seen before include "Decline" , "Playground chute" , "that's put under the microscope" , "Slip, slither, skid" , "Make mild fun of" .)