Bend seen in circular course (3)
I believe the answer is:
arc
'bend' is the definition.
(I know this)
'in circular course' is the wordplay.
'in' says the answer is hidden in the clue.
'ARC' is hidden in the letters of 'circular course'.
'seen' is the link.
(Other definitions for arc that I've seen before include "Something curved in shape" , "Semi-circle" , "A curve; a discharge" , "Bow" , "Part of a circular line" .)