Nucleic

3 clues
Of the core
Part of RNA
Organic acid
Similar answers:
Aleichem
Atomicnucleus
Bareknuckle
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Bewareknuckle
Brassknuckleband
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Canuc
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Canucksvstars
Cellnucleus
Cornucopia
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Enucleate
Eunuch
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Gnucontrol
Iannucci
Icenuclei