Stick together (4)
'stick together' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for glue that I've seen before include "size" , "Paste" , "Adhesive stuff" , "Fixative" , "Sticky stuff" .)
'stick together' is the definition.
(to cohere is to stick or fit together)
This is all the clue.
(Other definitions for cohere that I've seen before include "Stick or hold together and resist separation" , "Cling" , "Stick firmly together" , "Form a whole" , "Hang together" .)