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 a hidden word.
'ARC' can be found hidden inside 'marched'.
(Other definitions for arc that I've seen before include "Electric discharge" , "Something curved in shape" , "Bow" , "Bend" , "Rainbow, e.g." .)