Car goes round a bend (3)
I believe the answer is:
arc
'a bend' is the definition.
(I know this)
'car goes round' is the wordplay.
'goes round' indicates anagramming the letters.
'car' with letters rearranged gives 'ARC'.
(Other definitions for arc that I've seen before include "Half-moon" , "Section of circumference" , "Rainbow, e.g." , "Curved path" , "Car (anag.)" .)