Images skewed in discrimination (6)
I believe the answer is:
ageism
'discrimination' is the definition.
(I know that ageism is a type of discrimination)
'images skewed' is the wordplay.
'skewed' indicates anagramming the letters.
'images' with letters rearranged gives 'AGEISM'.
'in' acts as a link.
(Other definitions for ageism that I've seen before include "Resentment of the more experienced" , "Prejudice based on advanced years" , "Prejudice or bias against old people" , "discriminating against the elderly?" , "Prejudice in relation to advanced years" .)