Marched round the bend (3)
I believe the answer is:
arc
'the bend' is the definition.
(arc can mean to curve or bend)
'marched round' is the wordplay.
'ARC' is hidden in amongst the letters.
However, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for arc that I've seen before include "A curve; a discharge" , "Electrical spark" , "Segment of circle" , "section of Circle Line" , "Something used to weld" .)