Two bones carrying some RNA particles (9)

I believe the answer is:

ribosomes

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'rna particles' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'two bones carrying some' is the wordplay.
'two bones' can mean two replacements for 'bone'.
'bone' becomes 'rib' (rib is a type of bone).
'bone' becomes 'os' (Latin for 'bone').
'carrying' means one lot of letters goes inside another.
'os' enclosing 'some' is 'osomes'.
'rib'+'osomes'='RIBOSOMES'

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I've seen this clue in The Times and The Sunday Times.

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