Bend seen in larch (3)
I believe the answer is:
'bend' is the definition.
(I know that arc is a type of bend)
'in larch' is the wordplay.
'in' says the answer is hidden in the clue.
'ARC' is hidden within 'larch'.
'seen' is the link.
(Other definitions for arc that I've seen before include "Section of curve" , "Semi-circle" , "less than the complete circuit" , "Part of a curve" , "Something curved in shape" .)