Royal pincer movement (6)
I believe the answer is:
prince
'royal' is the definition.
(prince is a kind of royal)
'pincer movement' is the wordplay.
'movement' indicates an anagram (letters move around).
'pincer' is an anagram of 'PRINCE'.
(Other definitions for prince that I've seen before include "Monarch's son" , "Boxer Naseem Hamed's "title"" , "Sovereign's son" , "See 1" , "Son of a royal house" .)