Nipper moved prince (6)
I believe the answer is:
pincer
'nipper' is the definition.
('pincer' can be a synonym of 'nipper')
'moved prince' is the wordplay.
'moved' indicates anagramming the letters.
'prince' with letters rearranged gives 'PINCER'.
(Other definitions for pincer that I've seen before include "Crab's nipper" , "Lobster's claw" , "Surrounding (movement)" , "Front claw" , "Crab's claw" .)