Puckish entrance leading to bow (4)
I believe the answer is:
arch
I believe this is a quadruple definition!!
'puckish' is the first definition.
(I've seen this in another clue)
'entrance' is the second definition.
(arch is a kind of entrance)
'leading' is the third definition.
(e.g. in arch-enemy)
'to bow' is the fourth definition.
(both can mean to curve)
(Other definitions for arch that I've seen before include "Embow" , "Bend into upward curve" , "Char the curved structure" , "Inner side of foot" , "Curve of the foot" .)