Glue or hide vase that's smashed (8)
I believe the answer is:
adhesive
'glue' is the definition.
(I've seen this before)
'hide vase that's smashed' is the wordplay.
'that's smashed' indicates anagramming the letters.
'hide'+'vase'='hidevase'
'hidevase' anagrammed gives 'ADHESIVE'.
'or' acts as a link.
(Other definitions for adhesive that I've seen before include "Glue, gum" , "doing some bonding" , "Hide vase (anag)" , "What a sticker" , "Binding" .)