Barring Connery's lead, classic version of Bond (5)
I believe the answer is:
ionic
'version of bond' is the definition.
(ionic bond is a type of chemical bond)
I don't understand the rest of the clue.
(Other definitions for ionic that I've seen before include "in ancient Greece?" , "A classical order of architecture" , "Support (a weight)" , "not capped" , "Classical dialect" .)