Kind of bond in chemistry (5)
I believe the answer is:
ionic
'kind of bond in chemistry' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ionic that I've seen before include "Pertaining to charged particle" , "A classical order of architecture" , "Classical verse" , "One of five classical orders of architecture" , "Like a sort of bond" .)