With which one sees stars become smaller (9)
I believe the answer is:
telescope
'become smaller' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for telescope that I've seen before include "Astronomer's instrument" , "Instrument for viewing from afar" , "Instrument to magnify the image of distant objects" , "Compress like optical instrument that magnifies" , "Magnifier of distant objects" .)