Nipper moved prince (6)
I believe the answer is:
Here is my best explanation:
'nipper' is the definition.
('pincer' can be a synonym of 'nipper')
'moved prince' is the subsidiary indication.
'moved' is an anagram indicator.
'prince' is an anagram of 'pincer'.
(Other definitions for pincer that I've seen before include "Grasping limb of a crustacean", "Surrounding (movement)", "Nipper", "Crab's nipper", "Lobster's claw", "Crab's claw", "Claw, nipper", "Front claw" and "This movement is a converging attack".)