Move bishop, gentle prompt to sacrifice knight (5)

I believe the answer is:

budge

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'move' is the definition.
(to budge is to move slightly)

I can't explain the rest of the clue.

(Other definitions for budge that I've seen before include "Shift or yield" , "Shift slightly, or cause to alter position" , "Cause to alter an opinion or stance, shift" , "Make a slight movement" , "Move slightly, or cause shift in opinion" .)

I've seen this clue in The Guardian.

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