Crossword Genius

Particle quietly splitting gave the game away (6)

Ross

I believe the answer is:

lepton

'particle' is the definition.
(lepton is a kind of particle)

'quietly splitting gave the game away' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'splitting' means one lot of letters goes inside another.
'gave the game away' becomes 'let on' (to let on is to give a secret away).
'p' inserted within 'leton' is 'LEPTON'.

(Another definition for lepton that I've seen is " Subatomic particle".)

I've seen this clue in The Guardian.
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