Crossword Genius

Smoke swirling over new elementary particle (1-5)

Ross

I believe the answer is:

k-meson

'elementary particle' is the definition.
(k-meson is a kind of elementary particle)

'smoke swirling over new' is the wordplay.
'swirling' indicates anagramming the letters (letters get swirled around).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'smoke' is an anagram of 'kmeso'.
'kmeso'+'n'='K-MESON'

I've seen this clue in The Times.
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