Crossword Genius

Be unreasonably variable (4,3,6)

Ross

I believe the answer is:

chop and change

(Other definitions for chop and change that I've seen before include "Keep on altering things" , "Seesaw (metaphorically)" , "Make alterations" , "Repeatedly vary one's preference" , "Move things around, often for no good reason" .)

I've seen this clue in the Sydney Morning Herald.
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