The most common and most likely answer to this crossword clue is the 2 plus 3 plus 4 plus 5 plus 2 plus 6 plus 3 plus 4 plus 2 letter word WE ARE SUCH STUFF AS DREAMS ARE MADE ON
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Buddy explains!
The straight part
We know that "it’s a brief unreal experience for us!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s a brief unreal experience for us! = we are such stuff as dreams are made on.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.