Produce nearly identical copies. One hundred and fifty one? (5)
I believe the answer is:
clone
'produce nearly identical copies one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'hundred and fifty one?' is the wordplay.
'hundred' becomes 'c' (Roman numeral).
'and' is a charade indicator (letters next to each other).
'fifty' becomes 'l' (Roman numeral).
'c'+'l'+'one'='CLONE'
Can you help me to learn more?
(Other definitions for clone that I've seen before include "Organism reproduced asexually from one ancestor, like Dolly the sheep" , "Person resembling someone else" , "Exact replica" , "Genetic double" , "Exact copy" .)