Marched around bend (3)
I believe the answer is:
arc
'bend' is the definition.
(arc can mean to curve or bend)
'marched around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'ARC' is hidden in the letters of 'marched'.
(Other definitions for arc that I've seen before include "Electric discharge" , "Something curved in shape" , "Bow" , "Bend" , "Rainbow, e.g." .)