Jam, of course, can behave like glue (5)
I believe the answer is:
stick
'glue' is the definition.
(to stick with glue)
'jam of course can behave' is the wordplay.
I cannot really understand how this works, but
'course' could be 's' and 's' is found within the answer.
The remaining letters 'tick' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'like' is the link.
Can you help me to learn more?
(Other definitions for stick that I've seen before include "Cane; criticism" , "Baton; gum" , "See 2" , "Adhere; baton" , "Switch < put up" .)