Cryptic crossword clue
Diffusing energy in sex-appeal – a help when turning up in music party 9

The most common and most likely answer to this crossword clue is the 9 letter word RADIATIVE

I've seen this crossword clue in Independent
R
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Buddy explains!

The straight part
We know that "Diffusing energy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case diffusing energy = radiative.
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.

What does RADIATIVE mean?

RADIATIVE adjective
  1. Of, relating to, or occurring through radiation

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