Keep close to a walking companion? (5)
I believe the answer is:
stick
'keep' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for stick that I've seen before include "heavy criticism" , "Join firm" , "Baton; gum" , "Gear lever; adhere" , "School punishment once" .)