Bond agent smashing luge in crash (9)
I believe the answer is:
superglue
'bond agent' is the definition.
(substance creating an adhesive bond)
'smashing luge in crash' is the wordplay.
'smashing' becomes 'super' (both can very good).
'in crash' indicates anagramming the letters.
'luge' with letters rearranged gives 'glue'.
'super'+'glue'='SUPERGLUE'
(Other definitions for superglue that I've seen before include "Extra strong adhesive" , "Gripper" , "that'll fix a lot of things!" , "Substance used to stick" , "solution" .)