Video caught a ship with alien beside a mirror? (8)
I believe the answer is:
cassette
'video' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cassette that I've seen before include "Recording medium" , "Form of tape" , "Music player" , "Recorder would accommodate this" , "something from old-fashioned language laboratory?" .)