Bend pen (4)
I believe the answer is:
fold
This clue is a double definition.
'bend' is the first definition.
(I know that bend can be written as fold)
'pen' is the second definition.
(I know that fold is a type of pen)
(Other definitions for fold that I've seen before include "Congregation; (firm) go bankrupt" , "Small pen for sheep" , "Cease trading" , "Sheep pen; disintegrate" , "Pleat; sheep pen" .)