Pinches back, in turn (4)
I believe the answer is:
spin
'turn' is the definition.
(I know that spin is a type of gyration)
'pinches back' is the wordplay.
'pinches' becomes 'nips' ('nip' can be a synonym of 'pinch').
'back' shows that the letters should be reversed in order.
'nips' in reverse letter order is 'SPIN'.
'in' is the link.
(Other definitions for spin that I've seen before include "Rotate repeatedly" , "Rotate on pins" , "some doctors deal with" , "cycle ride" , "present information favourably" .)