She helps hang out the washing (3)
I believe the answer is:
peg
'she' is the definition.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for peg that I've seen before include "that may have hat or coat on" , "Wooden pin, small marker" , "Member" , "Small cylindrical pin" , "Wooden or plastic pin for hanging clothes" .)