Type of camera lens (9)
'type of camera lens' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for telephoto that I've seen before include "Kind of lens" , "Long-distance lens" , "Distant shooter" , "Sort of lens" , "Magnifying lens in a camera" .)
(Other definitions for fisheye that I've seen before include "Very wide-angle lens" , "Kind of lens" .)