Visions (6)
I believe the answer is:
dreams
'visions' is the definition.
(dream is a kind of vision)
This is the entire clue.
(Other definitions for dreams that I've seen before include "'''We are such stuff as ... are made on'' The Tempest (6)'" , "Reveries or cherished aspirations" , "Thoughts and visions during sleep" , "'We are such stuff / As dreams are made on' (The Tempest)" , "Imaginings" .)