In camp, a guy may be attached to her (3)
I believe the answer is:
peg
'her' is the definition.
(I've seen this before)
I cannot 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 "Kind of pin for hanging clothes" , "Wooden pin, small marker" , "Wooden or plastic pin for hanging clothes" , "Clip for attaching clothes to line" , "Small cylindrical pin" .)