Clinging part of a plant (7)
I believe the answer is:
tendril
'clinging part of a plant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tendril that I've seen before include "Twisted lock of hair" , "Clinging part of a plant" , "Climbing plant's supporter" , "Part of twining plant" , "Climbing plant's gripper" .)