Answer:

CLONER

Answer	Crossword Clue
CLONER	Certain scientist
CLONER	Worker with DNA, at times
CLONER	Plant geneticist, at times

CLONER	Certain geneticist
CLONER	Pioneering geneticist
CLONER	Worker with DNA, perhaps
CLONER	Dolly makere

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.