Cell material in heart of young Rudge (7)
I believe the answer is:
barnaby
'rudge' is the definition.
(barnaby rudge is a dickens novel)
'cell material in heart of young' is the wordplay.
'cell material' becomes 'rna' (ribonucleic acid is the complement to dna).
'in heart of' means one lot of letters goes inside another.
'young' becomes 'baby' (baby is a kind of young).
'rna' placed inside 'baby' is 'BARNABY'.
(Another definition for barnaby that I've seen is " Dickens novel ` `....... Rudge' '".)
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