Turning circle, more or less (10)
I believe the answer is:
roundabout
'turning' is the definition.
(thesaurus)
'circle more or less' is the wordplay.
'circle' becomes 'round' (synonyms).
'more or less' becomes 'about' (synonyms).
'round'+'about'='ROUNDABOUT'
(Other definitions for roundabout that I've seen before include "A plaything" , "playground attraction" , "Indirect" , "It's not exactly" , "Circuitous" .)