The most common and most likely answer to this crossword clue is the 6 letter word XANADU
I've seen this crossword clue in Independent
X
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More clues leading to the result XANADU
- Part of Sussex — an adulterous ruler took his pleasure here
- Musical seen in Texan ad, unusually
- Kane’s estate secured by Texan, a dude
- Pleasure ground with cross and gold blend
- Sex, an adulteress admits, an attraction for Kubla Khan when hot
- ‘During sex …’ an adult person from Porlock interrupted its description
- Times article on top 60% of 6 in idyllic place
- Site of dome by youth centre and a poor lodging
- Stuck in mud, an axle’s flipped over in poet’s city
- Be leaving bandeaux around old Chinese summer capital
Buddy explains!

The straight part
We know that "person from Porlock interrupted its description" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person from porlock interrupted its description = xanadu.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.