Smashing images shows prejudice (6)
I believe the answer is:
ageism
'prejudice' is the definition.
(prejudice against older people)
'smashing images' is the wordplay.
'smashing' is an anagram indicator.
'images' anagrammed gives 'AGEISM'.
'shows' acts as a link.
(Other definitions for ageism that I've seen before include "Prejudice or bias against old people" , "Discrimination on the basis of longevity" , "Prejudice against older people" , "Resentment of the more experienced" , "Discrimination on the basis of the length of one's life" .)