In a dream, be worshipful about one (7)
I believe the answer is:
reverie
'in' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'a dream be worshipful about one' is the wordplay.
I cannot really understand how this works, but
'about' could be 're' (regarding) and 're' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for reverie that I've seen before include "Aimless train of thought" , "I revere being in a state of dreaminess" , "daydreaming" , "Mental abstraction" , "Daydream, meditation" .)