Ballerina's bend (4)
I believe the answer is:
plie
'ballerina's bend' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for plie that I've seen before include "Ballet movement bending knees while upright" , "Knees-bend ballet posture" , "8 [BALLET] term" , "Dance move" , "Classic ballet posture" .)