Timid, frightened (6)
I believe the answer is:
afraid
I believe this clue is a double definition.
'timid' is the first definition.
(associated in meaning)
'frightened' is the second definition.
(similar in meaning)
(Other definitions for afraid that I've seen before include "Filled with apprehension" , "Regretfully" , "wind up" , "cowardly" , "Scared - politely regretful" .)